Eric runs a surfing school on the north shore of oahu. he has two inputs: surfboards, which he rents from a local shop for $10 per day, and surfing instructors, whom he hires for $50 per day. eric has figured out that the marginal physical product (mpp) of the last instructor hired is 10 lessons, and the mpp of the last board used is 4 lessons. which of the following statements is correct: a.) eric could lower his costs without reducing his output if he employed more instructors and used fewer surfboards. b.)any of these answers may be right, depending on the price of a lesson. c.) eric could lower his costs without reducing his output if he employed fewer instructors and used more surfboards. d.) eric currently employs a cost-minimizing combination of surfboards and instructors.