Consider an aircraft maintenance station over a planning horizon of n periods. Let Cj be the available labor hours at period j, Aij be the number of aircraft of type i arriving for maintenance at period j, and Pi be the number of labor hours required to perform maintenance on aircraft type i. a) To determine the number of aircraft type i processed at period j, formulate the problem as a linear program.
b) Revise the model so that aircraft would not be delayed for too long.

Western electric has 32,000 shares of common stock outstanding at a price per share of $79 and a rate of return of 13.00 percent. the firm has 7,300 shares of 7.80 percent preferred stock outstanding at a price of $95.00 per share. the preferred stock has a par value of $100. the outstanding debt has a total face value of $404,000 and currently sells for 111 percent of face. the yield to maturity on the debt is 8.08 percent. what is the firm's weighted average cost of capital if the tax rate is 39 percent?