Ralph is painting the barn below, including the sides and roof. He wants to know how much paint to purchase. 4' 20' 45' 15' a. What is the total surface area that he is going to be painting? Round your answer to the nearest hundredth. b. If one paint can covers 57 square feet, how many paint cans should he purchase? c. If each paint can costs $23.50, how much will the paint cost? d. Once the barn is finished being painted, there is going to be a party. Ralph wants to know how many people to invite to the party. What is the volume of the inside of the barn? You must show all of your work to receive credit.