Massey tools, Inc. has a net profit margin of 4.0%, a total asset turnover of 2.7, total assets of $400 million, and a book value of equity of $250 million. Massey's current return-on-equity (ROE) is closest to:
a. 22.6%
b. 13.2%
c. 17.3%
d. 11.5%