Design a cash holding system following the Miller-Orr Model, if Supertram management had a lower cash balance of $14,000 and estimate its cash flow volatility at $29,000.

In 2021, Supertram keeps a cash balance of $25,500 a day. At the end of the day, Supertram runs out of cash and sell its short-term securities to replenish its cash balance. The fixed order cost is $40. The interest annual interest rate is 9%