Could you please show me how to solves this financial management question attached?

Karla Engineering Inc. (KEI) has the following capital structure, which it considers to be optimal: KEI's expected net income this year is $34,285.72; its established dividend payout ratio is 40%; its federal-plus-state tax rate is 35%; and investors expect future earnings and dividends to grow at a constant rate of 9%. KEI paid a dividend of $3.20 per share last year, and its stock currently sells for $54.00 per share. KEI can obtain new capital in the following ways: Preferred: New preferred stock with a dividend of $10.00 can be sold to the public at a price of $95.00 per share. Debt: Debt can be sold at an interest rate of 12%. a. Determine the cost of each capital component. b. Calculate the WACC. c. KEI has the following investment opportunities that are average-risk projects: Which projects should KEI accept? Why? Assume that KEI does not want to issue any new common stock