Answer:
$70.35 (3 cans)
Step-by-step explanation:
2 walls at 15' x 9' = 270 ft^2
2 walls at 20' x 9' = 360 ft^2
Total area = 630 ft^2
Total cost = (630 ft^2)*($23.45/250 ft^2) = $59.09
But we need to assume that we need to purchase whole gallons, not fractions of a can.
Each can covers 250 ft^2, so we'll need 3 can (750 ft^2) since 2 (500 ft^2) won't cover everything.
3 cans at $23.45 each is $70.35
