Question

A contractor charges $ 1,200 for 100 square feet of roofing installed. At this rate, how much does it cost to have 1,100 square feet installed

Answer 1

For this problem we can use a proportion to solve.

Set up the proportion.

`(1200)/(100) = (p)/(1100)\\`

Cross multiply.

`1200 * 1100 = 100 * p\\1320000 = 100p`

Divide.

`(1320000)/(100) = (100)/(100)p\\13200 = p`

So, it would cost $13,200 to have a 1,100 square foot roof installed.