Wentworth's Five and Dime Store has a cost of equity of 10.7 percent. The company has an aftertax cost of debt of 4.3 percent, and the tax rate is 23 percent. If the company's debt-equity ratio is .67, what is the weighted average cost of capital?

a.7.74%

b.6.24%

c.6.28%

d.8.13%

e.6.80%