The market value of Fluorites debt and equity capital totals $170 million, 70% of which is equity related. An analysis conducted by the company's finance department revealed a 7% after-tax cost of debt capital and a 11% cost of equity capital. On the basis of this information, Fluorites weighted-average cost of capital:

a. is 8.2%.

b. is 9.0%.

c. is 8.8%.

d. is 9.8%.