Lang enterprises is interested in measuring its overall cost of capital. Current investigation has gathered the following data. The firm is in the 40% tax bracket.

Debt. The firm can raise debt by selling $1,000-par-value, 7% coupon interest rate, 20- years bonds on which annual interest payments will be made. To sell the issue, an average discount of $20 per bond would have to be given. The firm also must pay flotation costs of $15 per bond

Preferred stock. the firm can sell 8% preferred stock at its $100-per-share par value. The cost of issuing and selling the preferred stock is expected to be $5 per share. Preferred stock can be sold under these terms

Common stock. The firm's common stock is currently selling for $50 per share. The firm expects to pay cash dividends of $5 per share next year.The firm's dividends have been growing at an annual rate of 6% and this growth is expected to continue into the future. To sell new shares of common stock, the firm must underprice the stock by $6 per share, and flotation costs are expected to amount to $6 per share. The firm can sell new common stock under these terms.

Retained earnings When measuring this cost, the firm does not concern itself with the tax bracket or brokerage fees of owners. It expects to have available $150,000 of retained earnings in the coming year; once these retained earnings are exhausted, the firm will use new common stock as the form of common stock equity financing.

a. The after-tax cost of debt using the approximation formula is_______%(round to two decimal places)

b. The cost of preferred stock is______%( round to two decimal places)

c. The cost of retained earnings is______% ( Round to two decimal places)

b.The cost of new common stock is _______% (round to two decimal places )

Please answer all parts with CORECCT answer , Thank you