Revenues and disbursements associated with the sale of a tool loading system and the resulting net cash flow amounts are recorded. (a) Use sign-change rules to determine the possible number of i* values. (b) Find all i* values. (c) If the required MARR for the company is 10% per year, how small can the arthritic gradient be for years 3 through 6? Year 0 2 3 4 5 6 Cash Flow, $ -5,000 -10,100 4,500 6,500 8,500 10,500 | 12,500 1