If the Growth Rate of the Capital Stock Is 9

If the growth rate of the capital stock is 9 percent, the user cost of capital is 13 percent, the capital depreciation rate is 3 percent, and capital gain is 1 percent, the investment rate is about:

A) 6.6 percent
B) 30.8 percent
C) 11.7 percent
D) 1.4 percent
E) 50 percent