Given:
cost of family-size pizza with only cheese = $9.99
Each additional toppings costs = $0.90
Tax on pizza = 6%
delivery fee = $150
Susan orders a family-size pizza with 3 extra toppings
The total cost of her order is the sum of the pizza, the toppings , tax and delivery fee
First let's us find the cost of the pizza plus the toppings:

Next, we add the tax:

Finally, we add the delivery fee:

Hence, the total cost is:

Answer: $14.95