IRIS Corp. has determined its optimal capital structure as image Debt: The firm can sell a 10-year, $1,000 par value, 7 percent bond for $950. A flotation cost of 3percent of the par value would be...

• IRIS Corp. has determined its optimal capital structure as image

Debt:The firm can sell a 10-year, $1,000 par value, 7 percent bond for $950. A flotation cost of 3percent of the par value would be required in addition to the discount of $50.Preferred Stock:The firm has determined it can issue preferred stock at $45 per share par value. The stock will pay an $6.5 annual dividend. The cost of issuing and selling the stock is $2.5 per share.

Common Stock:The firm's common stock is currently selling for $25 per share. The dividend expected to be paid at the end of the coming year is $3.75. Its dividend payments have been growing at a constant rate for the last five years. Five years ago, the dividend was $1.45. It is expected that to sell, a new common stock issue must be underpriced at $2 per share and the firm must pay $0.75 per share in flotation costs.

Additionally, the firm's marginal tax rate is 20 percent. Calculate the firm's weighted average cost of capital assuming the firm has exhausted all retained earnings.

I asked the question but answer is not open for explain. can you show me the formulas ın more detail.