2. Industrial Footwear Inc. uses capita1(K) and labour (L) to produce workboots. Suppose this rm is using capital and labour such that the marginal product of capital (MPK) is equal to 80 and the marginal product of labour (MPL) is equal to 20. For each set of per-unit prices of capital and labour (PK and PL) given below, determine whether the rm is minimizing its costs. If it is not, determine the direction factor substitution the rm should make in order to do so. a) PK:$2 and PL: $10 (1 mark) b) PK:$20 and PL: $5 (1 mark) 0) PK=$40 and PL: $5 (1 mark) l