At JOMO's Pizzeria, you can design your own pizza. You can choose from any of the 6 toppings: Pepperoni, Salami, Onions, Mushrooms, Pineapples, and Ham. You can also choose between a thick and thin crust. A plain pizza with no toppings costs $120 HKD. Each extra topping you add on costs an extra $20 HKD. If I only have $200 HKD, how many different types of pizza could I order?
Details and Assumptions
You are allowed to order a Pizza with repeating toppings, so you could order a pizza with 3 toppings of all pineapple.
This problem was taken from JOMO.