Wendells Donut Shoppe is investigating the purchase of a new $34,600 donut-making machine. The new machine would permit the company to reduce the amount of part-time help needed, at a cost savings of $6,500 per year. In addition, the new machine would allow the company to produce one new style of donut, resulting in the sale of 2,500 dozen more donuts each year. The company realizes a contribution margin of $1.60 per dozen donuts sold. The new machine would have a six-year useful life

1. Find the internal rate of return promised by the new machine using the following terms: annual cash inflow, annual cash outflow, investment required (note that all three may not be used)

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