Jamie's marginal utility from muffins and from doughnuts (in utils) is shown in the accompanying table. Jamie spends a total of $8 on muffins and/or doughnuts every morning. The price of each muffin is $2 and the price of each doughnut is $1.MuffinsPer DayMarginal UtilityPer MuffinDoughnutsPer DayMarginal UtilityPer Doughnut140220230415320510If Jamie consumes 3 muffins a day, then what is her marginal utility per dollar spent on the third muffin?
A. 30
B. 20
C. 10
D. 40
Answer: C
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