# coding problem about Sales Taxes

Claire Fuente
Ranch Hand
Posts: 35
Hi Guys!

I need a code that works on a sample problem below. I am not a good java programmer and I'm trying to do it too but my solution might be incorrect. You may not use any external libraries to solve this problem, but you may use external libraries or tools for building or testing purposes. Specifically, you may use unit testing libraries or build tools available for your chosen language (e.g., JUnit, Ant, NUnit, Rspec, Rake, etc.)

PROBLEM TWO: SALES TAXES

Basic sales tax is applicable at a rate of 10% on all goods, except books, food, and medical products that are exempt. Import duty is an additional sales tax applicable on all imported goods at a rate of 5%, with no exemptions.

When I purchase items I receive a receipt which lists the name of all the items and their price (including tax), finishing with the total cost of the items, and the total amounts of sales taxes paid. The rounding rules for sales tax are that for a tax rate of n%, a shelf price of p contains (np/100 rounded up to the nearest 0.05) amount of sales tax.

Write an application that prints out the receipt details for these shopping baskets...
INPUT:

Input 1:
1 book at 12.49
1 music CD at 14.99
1 chocolate bar at 0.85

Input 2:
1 imported box of chocolates at 10.00
1 imported bottle of perfume at 47.50

Input 3:
1 imported bottle of perfume at 27.99
1 bottle of perfume at 18.99
1 packet of headache pills at 9.75
1 box of imported chocolates at 11.25

OUTPUT

Output 1:
1 book : 12.49
1 music CD: 16.49
1 chocolate bar: 0.85
Sales Taxes: 1.50
Total: 29.83

Output 2:
1 imported box of chocolates: 10.50
1 imported bottle of perfume: 54.65
Sales Taxes: 7.65
Total: 65.15

Output 3:
1 imported bottle of perfume: 32.19
1 bottle of perfume: 20.89
1 packet of headache pills: 9.75
1 imported box of chocolates: 11.85
Sales Taxes: 6.70
Total: 74.68

Campbell Ritchie
Sheriff
Posts: 50284
80

How would you calculate that by hand? Write it down, and make it simpler and simpler. When you get down to words of one syllable, you will have a form which can easily be converted to code.

Claire Fuente
Ranch Hand
Posts: 35
Campbell Ritchie wrote:
You will find life much simpler if you complete one assignment at a time. What you learn from one will help you solve the others. Try the tax example first.

I'm trying to do your advice and wrote down the possible modules needed in this problem. I also thought of starting with the sales tax problem since I find it easiest to analyze. However, I'm stuck on the formula on how I would do a syntax on

"The rounding rules for sales tax are that for a tax rate of n%, a shelf price of p contains (np/100 rounded up to the nearest 0.05) amount of sales tax. "

Sorry but I'm not good in math .

I got the output right on sample:

Given :
Basic tax = 10%
import duty is additional = 5% no exemptions

1 imported bottle of perfume at 27.99 x (10%+5%) = 4.2

27.99 + 4.2 = 32.19

Output 3:
1 imported bottle of perfume: 32.19

But got a different answer when the input is:
1 imported bottle of perfume at 47.50 x (10%+5%) = 7.125

47.5 + 7.125 = 54.625

Expected output is :
1 imported bottle of perfume: 54.65

Henry Wong
author
Marshal
Posts: 21518
84
Claire Fuente wrote:
I'm trying to do your advice and wrote down the possible modules needed in this problem. I also thought of starting with the sales tax problem since I find it easiest to analyze. However, I'm stuck on the formula on how I would do a syntax on

"The rounding rules for sales tax are that for a tax rate of n%, a shelf price of p contains (np/100 rounded up to the nearest 0.05) amount of sales tax. "

Sorry but I'm not good in math .

You are over-thinking it. The rounding rules basically say that the government don't like pennies. Just calculate the tax and round up to the nearest nickel. You don't need any special math to round up to the nearest nickel right?

Henry