John is trying to decide how to divide his time between his job as a stocker in the local grocery store, which pays $7 per hour for as many hours as he chooses to work, and cleaning windows for the businesses downtown. He makes $2 for every window he cleans. John is indifferent between the two tasks, and the number of windows he can clean depends on how many hours he spends cleaning in a day, as shown in the table below:Hours PerDay CleaningWindowsTotal Numberof WindowsCleaned0017211314416517Should John spend a third hour cleaning windows?
A. Yes, because the additional amount he would earn is $6, which is better than earning nothing.
B. No, because the additional amount he would earn is $6, which is less than his opportunity cost of $7.
C. Yes, because he would earn $28.
D. Yes, because the additional amount he would earn is $14, which is greater than his opportunity cost of $7.
Answer: B
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