Mike's income is $600 per month. He spends all of it on books (B) and CDs (C). Books cost $10 and CDs cost $15. His preferences correspond to the utility function U(B,C) = B × C. For that utility function, the marginal benefit of books is C and the marginal benefit of CDs is B. How many books and how many CDs will he purchase in a month?
A. 20 CDs and 30 Books
B. 60 CDs and 10 Books
C. 15 CDs and 40 Books
D. 30 CDs and 15 Books
A. 20 CDs and 30 Books
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