The concrete for a sidewalk is being poured outside the perimeter of Oliver Street School, which is a 280 ft. × 720 ft. rectangle. The building code requires that the sidewalk be 5 feet wide and 8 inches deep. a. How many cubic yards of concrete will need to be poured? b. How much will the concrete for the new side walk cost if the price per cubic yard of concrete is $74.50 and an extra 5% of concrete is being ordered?(Hint draw a diagram on a scrap paper to help you solve it correctly)