Question 402710: Nicholas wants to order a pizza. He has a total of $13.00 to pay the delivery person. The pizza costs $7.50 plus $1.25 per topping. If he plans to tip 15% of the otal cost of the pizza, how many toppings can he order?
Answer by rvquartz(19)   (Show Source):
You can put this solution on YOUR website! total pizza cost = x
tip = y
since tip is 15% of total pizza cost, then
y = 0.15x
since total he has to give the delivery person is 13 dollars, then
x + y = 13
substituting for y
x + 0.15x = 13
this is the same as
1.15x = 13
x = 11.30
so total cost of pizza cannot be more than $11.30
pizza base cost is $7.50 so he has left over for toppings
$11.30 MINUS $7.50 = $3.80
he has $3.80 to spend on toppings and each topping costs $1.25
3.80 divided by 1.25 = 3 remainder 0.05
he can buy up to three toppings
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