Barbara just stopped at the Texaco station on the way to work and bought four Snickers candy bars, two 20-ounce bottles of grape Snapple, and 10 gallons of gas. His total marginal-utility-to-price ratio for each of the items is: 3.21 for the Snicker, 4.8 for the Snapples, and 5.7 for gallons of gas. Explain why this set of purchases did not maximize his utility and how could he have increased his utility