For the next financial year, Milestones Enterprises (Milestones) is considering using the Miller-Orr model to manage its cash flows. The minimum cash balance would be R200 000. A management accountant at Milestones has estimated that the variance of daily cash flows is R3 600 000 000 (i.e., the standard deviation is approximately R60 000). The cost of buying or selling marketable securities is R100, and the daily interest rate is 1%. 2.3.1. Calculate the spread (round off answer to nearest thousand). (4 marks) 2.3.2. Calculate the Miller-Orr model upper limit and return point. (4 marks) 2.3.3. Explain how the upper limit and return point would be used to manage the cash balances of Milestones