Consider the following data for hypothetical economy: Bats Balls 0 20 10 18 20 14 30 8 40 a. Graph the production possibility frontier and label A through E b. What is the opportunity cost (in terms of Balls given up) of the 1st 10, the 2nd 10, and the third group 10 bats? c. What is the pattern of the opportunity costs derived in (b)? d. What is the explanation for the pattern of the opportunity costs identified in (c)