has compiled the following financial data:

Source of Capital	Target Market Proportion	After-Tax Cost
Long Term Debt	20%	5%
Preferred Stock	10%	10%
Common Stock	?	20%

The weighted average cost of capital is:

		a. 12 %
		b. 14.5%
		c. 16%
		d. We need the target market proportion of common stock to solve this problem