# Happy Feet would like to maintain their cash account at a mi…

Happy Feet would like to maintain their cash account at a minimum level of $75,000, but expects the standard deviation in net daily cash flows to be $5,000; the effective annual rate on marketable securities to be 7 percent per year; and the trading cost per sale or purchase of marketable securities to be $150 per transaction. What will be their optimal upper cash limit?