Rumolt Motors has 28 million shares outstanding with a share price of $59 per share. In addition, Rumolt has issued bonds with a total current market value of $456 million. Suppose Rumolt's equity cost of capital is 11%, and its debt cost of capital is 7%. a. What is Rumolt's pre-tax WACC? b. If Rumolt's corporate tax rate is 22%, what is its after-tax WACC?

Tried solving it on my own but I think I'm either missing a step or doing something completely wrong. thanks in advance