please show all steps to solve a, b and c... do not use excel. thanks!

310 Wellington Gas has a Capital structure consisting of debt and common equity, Assume the following information Debt Equity weight of debt = 30% weight of equity = 70% Cost of debt = 10% up to $1, 500,000 Cost of internally generated fund = 16% Cost of debt = 12% over $ 1,500, 000 Cost of issuing new common stock = 18% Tax rate = 25% Retained Earnings = $2, 800,000 a) calculate both equity and debt breaks, b) Calculate the weighted average cost of capital before equity break. O Calculate the weighted average cost of capital between the breaks