28.5 Lisa Tylor, CFO of Purple Rain Co., concluded from the Baumol model that the optimal cash balance for the firm is $20 million. The annual interest rate on marketable securities is 7.5 percent. The fixed cost of selling securities to replenish cash is $5,000. Purple Rain’s cash flow pattern is well approximated by the Baumol model. What can you infer about Purple Rain’s average weekly cash disbursement?