单选题 An investor has a portfolio with 10 percent cash, 30 percent bonds, and 60 percent stock. If last year's return on cash was 2.0 percent, the return on bonds was 9.5 percent, and the return on stock was 25 percent, what was the return on the investor's portfolio?

A、

A. 22. 30%.
B、

B. 36.50%.
C、

C. 18.05%.

【正确答案】 C

【答案解析】Find the weighted mean of the returns. 0.10×0.02+0.30×0.095+0.60×0.25=18.05%.