sales-taxes-problem

This code answers the following problem:

PROBLEM: 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

Requirements

Built for Python 2.7.10 To download and install python follow any guide you can find python.org To run it:

python taxes-calculator.py

How to run it

In the code there are unitTest, to avoid the tests comment the line (should be the last one)

unittest.main()

The object works this way:

• Init

tax = taxCalculator()

• Add items (add Strings)

tax.addItem('1 imported bottle of perfume at 47.50')
...

• Calculate tax

tax.calculateTax()

• Read the data (it's an array of Strings)

tax.taxedItems

Note that the calculateTax() method adds two lines to the taxedItems array:

Sales Taxes: 6.70
Total: 74.68

• Clear the data

tax.clear()

This is essential if you run calculateTax() because the method just add lines to the array, and it does not clear it

How it internally works

Once you add the item such as 1 box of imported chocolates at 11.25 if you run the calculateTax method this happen:

• Replace the ' at ' part of the item with ': '
• If the item has to be taxed (so if the string does not contains book, chocolate, pill or headache) add 10% tax
• If the item is imported (so if the string contains the word imported) add 5% tax
• Modify the item price based on the tax
• If the item is imported round the price to nearest 0.05 value
• Arrange the item in order to have the word imported right after the number So at the end you will have the item like 1 imported box of chocolates: 11.85

Remember that:

If you run calculateTax() the array of taxed items will have at the end the two lines for Sales Taxes and Total. The method clear() will clear all items

License

Normal MIT (see LICENSE file)