Answer:
The best answers is "B"
the marginal utility of the last bag of Doritos Fred bought is 50 units.
Step-by-step explanation:
According to the law of diminishing marginal utility, after some point the more we consume of something, the less each additional unit adds to our satisfaction.
the marginal utility of the last bag of Doritos Fred bought is 50 units because Crackerjacks cost twice as much as Doritos.