A general contractor is constructing a building that requires a concrete foundation that is to be 20 feet by 12 feet and 4 inches thick. if the local home supply store sells concrete for $125 per cubic yard, what will be the cost of the concrete for the foundation?

First we calculate the volume of the foundation: Volume (V) = 20 ft * 12 ft * 4 in (1 ft / 12 in) V = 80 ft^3   Since the cost is in cubic yard (yard^3) so convert: V = 80 ft^3 * (1 yard^3 / 27 ft^3) = 2.963 yard^3   So the total cost is: cost = ($125 / yard^3) * 2.963 yard^3 cost = $370.37