I need help doing the calculations in excel! Please help! The minimum cash balance of $20,000 is required at in the Village of Sarah town's general fund cash account. Transferring out of the account requires payment of $550 per transaction. Inspection of the variation of the account balance over the last year showed variation of $9,000,000. The monthly interest rate is 0.0055. Calculate the following items:

1. The spread between the upper and lower limits is

2. The upper limit:

3. The return point: