I do not understand this two questions. How do I get the answers for these?

Scenario 3.1: Andy derives utility from two goods, potato chips (Qp) and Cola (Qc). Andy receives zero utility unless he consumes some of at least one good. The marginal utility that he receives from the two goods is given as follows: lAH HHHH H N N n .- .- 77) Refer to Scenario 3.1. What is the total utility that Andy will receive if he consumes 5 units of potato chips (Qp) and no Cola drink (Qc)? A) 4 utils B) 10 utils C) 30 utils D) 40 utils E) none of the above Answer: D Diff: 1 Section: 3.5 78) Refer to Scenario 3.1. If the price of potato chips is $0.50 and the price of Cola is $4.00, and Andy has an unlimited income, how many units of potato chips will he consume? A) 5 B) 6 C) 7 D) 8 E) none of the above Answer: B D9392 Section: 3.5