For any given level of output: average fixed cost must be greater than average variable cost. average variable cost must be greater than average fixed cost. marginal cost must be greater than average cost. fixed cost must be greater than variable cost. None of the above is necessarily correct.

Andy purchases only two goods, apples (a) and kumquats (k). he has an income of $125 and can buy apples at $5 per pound and kumquats at $5 per pound. his utility function is u(a, k) = 6a + 2k. what is his marginal utility for apples and his marginal utility for kumquats? andy's marginal utility for apples (mu subscript a) is mu subscript aequals 6 and his marginal utility for kumquats (mu subscript k) is