A firm is considering a capital structure of the following: 

Debt $190 million, 

Preferred stock $250 million and common stock $900 million. 

The firm estimated that it has to pay lenders 6.5 percent after paying tax.

 Preferred stockholders currently demand a 8 percent rate of return, and common stockholders demand 15 percent. 

The tax rate is 21%. 

- The proportion of debt in this firm's capital structure is?

-The proportion of equity in this firm's capital structure is?

-The after-tax cost of debt is?

-The weighted average cost of capital is?