College Level Economics Question?

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nikballin88000

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Every week, Ben does gymnastics for four hours, and his grade on each math test is 85%. Last week, after working out for four hours, Ben considers working out for another hour. He decided to workout for one more hour and cut his study time by one hour. But last week, his math grade fell to 65%.

What was Ben's OPPORTUNITY COST of the FIFTH HOUR OF GYMNAMSTICS?



a. The extra hour of gymnastics
b. A 20% point drop in his math grade
c. One hour of study time
d. 85% in math
 
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