Utility and Consumer Choice Use utility theory to measure a consumer's satisfaction. Consider the chart below. The marginal utility for the fifth unit of Chicken Fajitas is _____. Quantity of Chicken Fajitas (1) Total Utility (2) 0 0 1 35 2 65 3 85 4 100 5 110 6 115 7 112 a.) +10 utils b.) +85 utils c.) +100 utils d.) +20 utils