Justin Stopped at the Gas Station on the Way to Campus

Essay

Justin stopped at the gas station on the way to campus and bought four candy bars, two 20-ounce bottles of juice, and 10 gallons of gas. His marginal-utility-to-price ratios are 3.2 for the candy bars, 4.8 for the juice, and 5.7 for the gas. Explain why this set of purchases did not maximize Ryan's utility and how could he have increased his utility.