I am working for this customer, pizza place. They do have a promotion going on, if you buy 6 can of drinks, the second pizza(cheapest) would be half price. Like if you are ordering 3 mushroom pizza(19$) and 2 Pepperoni (22$) and 6 cans of drink, then you will get 50% off 19$. My file is working fine for this discount.
However if you get 12 cans, then 2 pizza are discounted, and here is where my file fails to do. I need some help to fine a solution for this.
Pizza Table includes "Name", "price per unit", "Quantity", "Total price"
Shopping cart: includes a portal of pizzas