A contractor gives a quote of $21,060 to build an 18 foot by 24 foot barn. What is the building cost per square foot?

The area is 18 x 24 = 432 ft^2

Divide the quoted price by that area.

$48.75 per square root

To calculate the building cost per square foot, you need to find the total cost of the building and divide it by the total square footage.

To find the total square footage, multiply the length by the width of the barn:
18 ft * 24 ft = 432 square feet.

Next, divide the total cost by the total square footage:
$21,060 ÷ 432 = $48.75 per square foot.

Therefore, the building cost per square foot is $48.75.