Of the information below, determine the weighted average cost of capital

The capital structure consists of the following:

Stock Outstanding: $$300,000,000$

Bonds Outstanding $$80,000,000$

Preferred Stock: $$15,000,000$

After tax cost of debt $=4\mathrm{.}8$

Cost of preferred stock $=5\mathrm{.}8$

Expected return $=8\mathrm{.}5$