Exercise 16-14A (Algo) Determining the unadjusted rate of return LO 16-4 Stuart Painting Company is considering whether to purchase a new spray paint machine that costs $2,600 The machines expected to save labor, Increasing net income by $390 per year. The effective life of the machine is 15 years according to the manufacturer's estimate Required a. Determine the unadjusted rate of return based on the average cost of the Investment (Enter your answer as a whole percentage (e.g. 0.55 should be entered as 55).) Used to retom