A company has 10 million shares outstanding trading for $7 per share. It also has $300 million in outstanding debt.

A company has 10 million shares outstanding trading for $7 per share. It also has $300 million in outstanding debt. If its equity cost of capital is 15%, and its debt cost of capital is 9%, and its effective corporate tax rate is 40%, what is its weighted average cost of capital? (Show workings)