Problem:
HotFoot Shoes would like to maintain its cash account at a minimum level of $32,000, but expects the standard deviation in net daily cash flows to be $4,700, the effective annual rate on marketable securities to be 7.2 percent per year, and the trading cost per sale or purchase of marketable securities to be $270 per transaction.
Required:
Question: What will be its optimal cash return point?
Note: Please show basic calculation