Can someone cheak if I did "netPay" caculations right before I printed it

[indigo fractal]

<@&987246399047479336> please have a look, thanks.

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[meager monolith]

i think 111.672 is how much is taxed

meaning 18% taken off of gross is your net pay

no

it should be 82% (100% - 18%) of your gross pay

yes

yes but the tax isnt 82%. your net pay is 82%

do you understand why?

so can you tell me what your tax should be

cool you got it. can you rewrite your code so that it reflects what you've told me?

whatever you feel comfortable with. the output of the application should still be a dollar amount however

you have to subtract the tax to get net pay

closer

right now your gross pay and tax numbers are different units. gross pay being dollar amount and tax being a percentage. how would you get the total amount of tax you pay?

so net pay is gross pay - total amount of tax

right now tax is just a percentage point

do you know what 10% of 100 is?

no the total tax is 18% of your gross pay

how do you know 10 is 10% of 100

ok so how would you get 18% of your gross pay

not exactly, the would be true if gross pay was 100 but it's not. what did you get for your gross pay?

right so how would you find 18% of your gross pay?

i dont think that would be relevant to the question. remember how you found 10% of 100. 100 isnt a percentaage in this example

[tacit hatch]

suppose u have 10 pieces of cake and ur friends want to eat 20% cake. how much percent cake is left for u and how many pieces are that?

right!

10 pieces are ur gross cake.
20% is the tax deduction
and 8 pieces are ur net cake

so what math do u do to 10 pieces of cake to get to the 8 pieces?

(by involving ur 20% tax rate somehow)

that gives u 2. not 8

what else did ur brain do to get 8?

what concrete math formula/steps did ur brain apply when it was told "10 pieces net, 20% tax"

to get to the conclusion that it's 8 pieces gross

cmon ur so close. finish it off

so can u write down a concrete formula?

what if i say x pieces and y% tax

can u write it down instead of just explaining it with text?

give me math

but when i write 100 - 20 i get 80

and not 8

give me a concrete math formula

that involves x and y

% is not sth u can write in a concrete formula

and its also still incorrect

okay. let's step back and do another example

and this time take a close look at how ur brain does it

lets say u earned 300$ gross and the tax deduction is 25%. what's ur remaining net pay?

tell me the concrete dollar number

yes

so. now put it together into a single formula

write it out

that's still not something ur computer could understand

not yet

but I'm trying to walk u there. but somehow u try to resist it

see, i told ur brain the numbers 300 and 25

and it spit out 225

i want a single formula where i see the numbers 300 and 20

which results in 225

so all the math ur brain did, concrete in a single formula

without buzzwords. concrete

i dont see 300 and 20 in that message

gimme a formula that contains 300, 20 and = 225

yeah sorry

for example 300 * 25 = 225. but thats wrong
or 300 * (100 + 20) = 225 but thats also wrong

i want to see sth like that

but the correct one

put it into a single formula please. not two

use brackets (...)

i dont see 25 in that line

and no (...), which u will need as well

300 * (... 25...) = 225

try it more like this

we are getting closer though

awesome. now, technically i said 25 and not 0.25

yeah

well, u can't write %

but u could still write (100 / 25)

which gives u 0.25

300 * (1 - (100 / 25)) = 225

sooo. now we can make it dynamic

replace 300 by x and 25 by y

and u have the formula

and that's sth u can actually put in code now

sth that ur java actually understands

netPay = grossPay * (... taxRate...)

sth along those lines

try it out with our example

300 and 0.25

if its 225 its right. if not, it's not

don't just randomly code something. u always have to grab a concrete example and first play it through on paper or in ur head. only then u can compare ur code against it and debug effectively

🙂

it says 75

but the correct net pay would be 225

so ur code is incorrect still

execute ur code by hand

plug in the values

u will immediately see where it's wrong

like, take ur line 18 and plug in all the values. it will jump in ur face once u do

ur probably not entering the paranthesis correct in ur calculator

that said, thats not what ur code does anyway

ur missing a closing )

and it's 25 / 100

not 100 / 25

do the math by hand. one gives 4. the other 0.25

indeed

no haha. I'm sitting here in my bed, falling asleep

happens. but u have to learn how to debug small mistakes like that by just running through the example step by step

take ur code and plug in the values

netPay = grossPay * (totalPercent - (tax / totalPercent))

now put in the values

netPay = 300 * (1 - (0.25 / 1))

u might note that / 1 is absolutely obsolete

yeah. but u can remove that / 1

well. u wrote / 1

something divided by 1 doesnt change it

that division was only necessary if we work with 25 and 100 and not with 0.25

aaay u got it 🎉

now restore ur grossPay computation with the hours and ur done 👌

looks good

lol no worries. it always takes a bit when doing sth new

[orchid geode]

did you get it?

what do you mean a "duplicate" of a class? like a subclass of it?

or create another instance of the class?

maybe if you say what you're trying to achieve i can help you better

do you mean literally just copy and paste the source code of the class?

would copying and pasting the file itself be fine? cuz then you can just change the file name and change the name of the class accordingly

but i'm not sure why you'd need to make a duplicate of the source code itself

technically you could also copy the entire class and paste it in the same file and just change the name of the copied class and remove the "public" modifier and it wuld work just fine

though having two top-level classes in the same file is generally frowned up unless you have a good reason to do it as far as i know

but may i ask why you need to duplicate the source code?

i feel like you could just extend the class, no?

the bonus?

you could do that in the same class

is it a requirement from the course that you must have two classes?

one specifically for the bonus?

well technically theres not stopping you from doing that but it kinda of defeats the purpose of using an object oriented language

you can do everything inside the same class just fine

if you really want to compartmentalize the logic you should extend the first class, not copy the source code

are you familiar with inheritance?

subclassing

basically it lets you create a class that can do everything the first class and then build more things on top of it

in my opinion yes, the code isn't that complicated that you'd need to make multiple classes for it

plus if you haven't learned about subclassing yet it might not be very productive to do it

though you wouldn't even necessarily need to subclass the first one, just dealing with two classes at once would increase the complexity since it seems you're not familiar with managing the flow of information between multiple classes

well you already found a way to calculate the netpay right?

it doesnt have to

the bonus says each bubble teas adds to her total netpay, right?

so think about it, lets say you worked at a place and they paid your salary, then you paid your taxes and were left with your net salary

but you also sold some candy on your free time

since you dont have to pay taxes on the income from the candies, how would that income affect your total earnins for the month?

well its fine to do that if you just want to have the first version for backup

just do like i said, copy the class and paste it then change the name and remove "public" modifier

or create another file

but you changed the logic of the calculations

its no longer calculating her netpay from her job

and its calculating the price of the bubble tea as 15.51

then adding 3 dollars to the final amount

i think the bonus wanted you to keep the netpay amount she had received, and then calculated how much money the bubble tea sale would add

not exactly

you should scrap those changes and start again with the last class before the bonus

since you changed the logic way too much and you'd have to undo all the changes you made anyway

ok

so try again but this time dont mix the logic of calculating the netpay from her job and calculating the amount she earned from bubble tea sales

no

you will need to calculate her netpay from the job no matter what

and you are already doing that correctly

so no reason to do it again

the no tax is specifically for the bubble tea sales

her salary still gets taxed

not really

the salary gets taxed, the bubble tea sales dont

try this: just ask how many bubble teas she sold, then calculate how much money she'd make from the sales

dont do anything to the salary calculation

you do

you don't need to include any tax when calculating the income from bubble tea sales

yes sales from bubble tea are added to the netpay you ALREADY calculated

the netpay is already done, already taxed

now they want to know how much more she'll make from the bubble tea sales

and those sales arent taxed

try doing what i suggested, ask her how many bubble teas she sold then calculate how much she would make

from the sales

to make it easier, dont touch the first part of the code at all

just add more code do these things at the bottom

yes

go to the two closing curly brackets and just above them add more lines

then start coding the logic of the bonus calculation]

ALMOST

you're close but you arent calculating the total income from the bubble tea sales

you're just adding 3 dollars

well what do u need to calculate? total income

what is the formula for te total income of something?

if i sell X amount of bubble teas, and each bubble tea costs Y dollars, how do i calculate the amount i make

x * y

does that answer your question?

try the code now

yes

thats not it

you aren't calculating the income from the bubble tea

notice the teaSold variable was never used

very close

just needs some final adjustments

you calculated the income from bubble tea right?

now you need to add that income to the netpay you calculated from the salary

but right now you're replacing the original netpay with the income from bubble tea

so you're replacing one with the other

so if you do it the way you did you cant add them anymore

unless you calculate netpay again or change the order of the operations

can you find a way to calculate the income from the bubble tea sales without deleting the value of the netpay from the job?

well what do you do when you want to store the value of a calculation?

yes

but right now you're using the variable of netpay so you replace the calculation from the salary

so you cant add them together anymore

well you need to assign a variable but you cant use netpay, so what do you do?

yes

well you could call it anything you want but i'd pick something more specific

like salesIncome

yes but now you can calculate the total amount from her salary (netpay) and the bubble tea sales income

can you add them together?

yes

yes

the result is perfect

but you should probl give it another variable for the final result

totalIncome would be fine

yes

well you could change the texts to reflect what is being displayed

but yeah the code is correct

no

the text "net pay of bubble teas sold"

the value being displayed is something else so change the text to reflect that

no

the value being displayed is the total income for entire month

including all sources of money for that person

hr salary and bubble teas sale

yes