Problem
Case Study: Publix supermarkets like other grocery store uses a POS (Point of Sales) system. The user requirements are that the system shall accurately compute sales totals including discounts, taxes, refunds, and rebates. It should print an accurate receipt and update inventory counts accordingly. Some other user requirements:
a) Each sale shall be assigned a sales ID.
b) Each sale may have one or more items
c) Each sale may have one or more rebates.
d) Each sale may have only one receipt printed.
e) Each sales receipt may show future rebates on the back.
Create use cases, activity diagram, data transfer diagram, and sequence diagrams for the case study mentioned above.