Answer the following questions about the multiplier. a) If the MPE = 0, what is the multiplier? b) What happens to the multiplier as the MPC increases (all other values remaining the same)? It is c) What is the multiplier if the MPE =0.6667? (Round your answer to two decimal places.) d) What is the multiplier if the MPE = 0.8000? (Round your answer to two decimal places.)