Troy Has a Part-Time Job in a Book Store to Help

Multiple Choice

Troy has a part-time job in a book store to help pay for his college. He can work up to 30 hours each week at his job, which pays $9 per hour. The table below shows his utility from different levels of leisure and income. Troy currently works 20 hours per week. If he decides to work 30 hours instead, his marginal utility gain from the additional income is ____.

A) 12
B) 6
C) 3
D) 9