4. HotFoot Shoes would like to maintain its cash account at a minimum level of $41,000, but expects the standard deviation in net daily cash flows to be $5,600, the effective annual rate on marketable securities to be 5.9 percent per year, and the trading cost per sale or purchase of marketable securities to be $140 per transaction. What will be its optimal cash return point? (Use 365 days a year. Do not round intermediate calculations. Round your answer to 2 decimal places.)