Estimate the weighted average cost of capital (WACC).

Firm's shares are worth $442 million and debt is worth $74 million. The corporate tax rate is 21% and the firm is able to borrow at 4.5%. The firm is projected to maintain the same ratio of debt:equity in all years. Data on a suite of comparable firms is available below.

Comparable Firms

Firm	Equity Beta	Cost of Debt	Debt ($M)	Equity ($M)
Medialix	0.91	4.7%	24114	119956
AngloMed	0.96	4.2%	25	852
InglaterMed	1.06	5%	1546	3804
Strickland	1.09	1.6%	12479	83703
Premula	0.91	4%	28	7409
Maxitrol Intl.	1.42	4.5%	48	370
NexOl Media	0.94	4.9%	3339	10483

Apply capital asset pricing model as the model for deriving an estimate of the cost of equity, assuming that the risk-free rate is 3% and the market risk premium is 7%. You will have to account for the fact that the company's leverage is different to the leverage of comparable firms when estimating the equity component of the weighted average cost of capital.

What estimate would you give as the weighted average cost of capital?

Please show your work, I can't seem to carry through the steps without some error.