John Is Trying to Decide How to Divide His Time

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 accompanying table.  
John's benefit from his first hour cleaning windows is:

A) $14
B) $18
C) $7
D) $2.

Correct Answer:

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