One of your employees presented you the cash flow estimates (in $1000 units) for a new method of manufacturing box cutters for a 2-year period. (a) Apply the rule of signs to determine the maximum number of possible i values at aMARR of 5% per quarter: (b) Apply Norstrom's criterion to determine if there is only one positive rate of return value. (c) Is it possible to determine a positive i* for this net cash flow series that meets the MARR? Why or why not? (Note: More questions about this series are included in Problem 7.57 () .)