Every week, Mary plays the piano for three hours, and her grade on each English

Question

Every week, Mary plays the piano for three hours, and her grade on each English test is 30 percent. Last week, after playing for three hours, Mary considered playing for another hour. She decided to play for another hour and cut her study time by one hour. But last week, her English grade fell to 60 percent. Did Mary make her decision on the margin? Mary's decision was not made at the margin because she could have chosen not to play the piano but didn't Mary's decision was not made at the margin because the marginal cost of a lower grade always exceeds its marginal benefits Mary's decision was made at the marginal because her grade fell by only 20 percentage points Mary's made her decision at the marginal because the considered the benefit and cost of one additional hour of playing the piano Mary's decision was not made at the marginal because she didn't compare the total benefit and total cost of a third hour of playing the piano

Explanation / Answer

option E is correct.

becasue she is not calculated or compared the benefits and costs of her actions. she usually did it but not a pre planned activity.

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