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============================ Problem - Billing System ============================

On a retail website, the following discounts apply: 1. If the user is an employee of the store, he gets a 30% discount 2. If the user is an affiliate of the store, he gets a 10% discount 3. If the user has been a customer for over 2 years, he gets a 5% discount. 4. For every $100 on the bill, there would be a $ 5 discount (e.g. for $ 990, you get $ 45 as a discount). 5. The percentage based discounts do not apply on groceries. 6. A user can get only one of the percentage based discounts on a bill.

Write a program with test cases such that given a bill, it finds the net payable amount. Please note the stress is on object oriented approach and test coverage.