On each purchase governments impose sales taxes that depend on many criteria like:
- article category
- article origin (when different from the country in which the article is sold)
- shipping destination
Basic sales tax is applicable at a rate of 10% on all articles except the ones belonging to categories that are exempt:
- book
- food
- medical
Import duty is an additional sales tax applicable on all imported articles at a rate of 5%, with no exemptions.
For a shelf price of p and a tax rate of t% the tax amount is p*t/100 rounded up to the nearest 0.05.
Customers making a purchase receive a receipt containing:
- a list of items (quantity, article name and price with taxes)
- sales taxes due
- total to be paid (including taxes)
1 book at 12.49
1 music CD at 14.99
1 chocolate bar at 0.85
1 book: 12.49
1 music CD: 16.49
1 chocolate bar: 0.85
Sales Taxes: 1.50
Total: 29.83
1 imported box of chocolates at 10.00
1 imported bottle of perfume at 47.50
1 imported box of chocolates: 10.50
1 imported bottle of perfume: 54.65
Sales Taxes: 7.65
Total: 65.15
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
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
Design and implement a solution that prints the receipt for a purchase and demonstrate your problem solving approach and coding style and skills with a focus on:
- simple design
- separation of concerns
- readability
- testability
- Use a programming language of your choice
- Use a build automation tool
- Keep it simple: do not use third-party libraries apart for unit testing and, if needed, mocking frameworks (no Web, ORM, DI)
- Use any mechanism to provide input (hard coded data within a unit test is ok)
- Fulfill at least the scenarios provided in the example above