Question

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

Answer 1

$13,200

Explanation:

To solve this problem, we need to cross multiply. Lets input the values (1,200, 100, 1,100) as shown below:

`(100)/(1,200) = (1,100)/(x)`

Next we cross multiply. We multiply 100 and x, and we multiply 1,200 and 1,100.

`100(x)=100x`

`1,200(1,100)=1,320,000`

Now, lets put the values above back into the equation:

`100x=1,320,000`

The last step is to divide 1,320,000 by 100.

`x= (1,320,000)/(100)`

`x=13,200`

It will cost $13,200 to have 1,100 square feet installed.