As a multisaver customer
When I buy 3 apples at £1 each
I expect to pay £2.50
When I buy 4 apples at £1 each
I expect to pay £3.50
The basket class will have functions to show:
SubTotal()
Total()
TotalSaved()
When I buy 1 gizmo for £10
I expect to pay 20% tax
By Benjamin Babik