Given the following information: current assets $400; fixed assets = $500; accounts payable = $100; notes payable = $45; long-term debt = $455; equity $300; sales = $450; costs = $400; tax rate 34%. Suppose that current assets, costs, and accounts payable maintain a constant ratio to sales. If the firm is producing at 80% capacity, what is the total external financing needed if sales increase 25%? Assume the firm pays no dividends and all costs are variable. Select one: a. $66.25 b. $143.75 c. $33.75 d. $172.50 Choc