Olden Company has a tax rate of 40 percent. Information for the company is as follows:

	Amount	After-tax Cost
Mortgage bonds	$1,000,000	0.048
Unsecured bonds	3,000,000	0.050
Common stock	6,000,000	0.150

What is the weighted average cost of capital?

a.0.0366

b.0.0827

c.0.2480

d.0.1098