The cash flow (in $1000 units) associated with a new method of manufacturing box cutters is shown below for a 2-year period.

(a) Use Descartes’ rule to determine the maximum number of possible rate of return values.

(b) Use Norstrom’s criterion to determine if there is only one positive rate of return value.

Expenses, Revenue, Quarter $1000 $1000 0 20 0 1 20 5 2 10 10 3 10 25 4 10 26 5 10 20 6 15 17 7 12 15 8 15 2