what bundle of apple and kumquats should purchase to maximize utility?

Andy purchases only two goods, apples (a) and kumquats (k) He has an income of $120 and can buy apples at $4 per pound and kumquats at $6 per p His utility function is U(a, k) = 3a + 2k. That is, his (constant) marginal utility for apples is 3 and his marginal utility for kumquats is 2. What bundle of apples and kumquats should he purchase to maximize his utility? 20 Apples and 30 Kumquats