11. Andy purchases only two goods, apples (a) and kumquats (k). He has an income of $40 and can buy apples at $2 per pound and kumquats at $4 per pound. His utility function is U(a, k) = 3a + 5k. His (constant) marginal utility for apples is 3 and his marginal utility for kumquats is 5. What bundle of apples and kumquats should he purchase to maximize his utility