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.

Question

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.

Quizplus · Accepted Answer

In the first hour John spends cleaning windows he cleans 7 windows and earns $2 per window for a total benefit of $14.

John Is Trying to Decide How to Divide His Time