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.

(Please show me all the steps to solve this question without using a financial calculator thanks)