please do not use excel and show the full steps. Thank you in advance.

A firm has determined its optimal structure which is composed of the following sources and target market value proportions. Source of Capital Long-term debt Common stock equity Target Market Proportions 60% 40 Debt: The firm can sell a 15-year, $1,000 par value, 8 percent bond for $1,050. A flotation cost of 2 percent of the face value would be required in addition to the premium of $50. Common Stock: A firm's common stock is currently selling for $75 per share. The dividend expected to be paid at the end of the coming year is $5. Its dividend payments have been growing at a constant rate for the last five years. Five years ago, the dividend was $3.10. It is expected that to sell, a new common stock issue must be underpriced $2 per share and the firm $1 per share in flotation costs. Additionally, the firm has a marginal tax rate of 40 percent. Calculate must pay 1) The firm's before-tax cost of debt 2) The firm's after-tax cost of debt 3) The firm's cost of a new issue of common stock 4) The firm's cost of retained earnings 5) The weighted average cost of capital up to the point when retained earnings are exhausted 6) The weighted average cost of capital if the firm plans to pay out all of its earnings as dividends