The Griswold Co. produces 1,500 batteries per day at a cost of $6 per battery for materials and labor. It takes the firm 22 days to convert raw materials into a battery and make a sale. Griswold allows its customers 40 days in which to pay for the batteries, and the firm pays its suppliers in 30 days. Under these conditions, what is the dollar amount of working capital Griswold must finance