The BM firm expects a total need of $12,500 over the next 3 months. They have a beginning cash balance of $1500, and cash is replenished when it hits zero. The fixed cost of selling securities to replenish cash balances is $3.50. The interest rate on marketable securities is 8% per annum. There is a constant rate of cash disbursement and no cash receipts during the month. On an average day, a company writes checks totaling $1,500. These checks take 7 days to clear. The company receives checks totaling $1,800. These checks take 4 days to clear. The cost of debt is 9%. What is the firm's disbursement float?