Self-tightening wedge grips are designed for tensile testing applications up to 1200 pounds. The cash flows associated with the product are available below. Determine the following from these values: net cash flow series, cumulative cash flow series, and i* displayed by the IRR spreadsheet function, if an option for €œguess€ is not entered.

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Year 1 3 2 4 4,000 Revenue Costs 13,000 25,000 70,000 -12,000 -30,000 -7,000 -6,000