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9-79 A newspaper is considering buying locked vend- ing machines to replace open newspaper racks in the downtown area. The vending machines cost $75 each. It is expected that the annual revenue from sell- ing the same quantity of newspapers will increase $12 per vending machine. The useful life of the vending machine is unknown. (a) To determine the sensitivity of rate of return to useful life, prepare a graph for rate of return versus useful life for lives up to 10 years. (b) If the newspaper requires a 15% rate of return, what minimum useful life must it obtain from the vending machines? (c) What would be the rate of return if the vending machines were to last indefinitely? 9-79 A newspaper is considering buying locked vend- ing machines to replace open newspaper racks in the downtown area. The vending machines cost $75 each. It is expected that the annual revenue from sell- ing the same quantity of newspapers will increase $12 per vending machine. The useful life of the vending machine is unknown. (a) To determine the sensitivity of rate of return to useful life, prepare a graph for rate of return versus useful life for lives up to 10 years. (b) If the newspaper requires a 15% rate of return, what minimum useful life must it obtain from the vending machines? (c) What would be the rate of return if the vending machines were to last indefinitely