Horn Company is considering the purchase of a new machine for $108,000. The machine would replace an old piece of equipment that costs $41,830 per year to operate. The new machine would cost $25,720 per year to operate. The old machine currently in use can be sold for $9,500 if the new machine is purchased. The new machine would have a useful life of ten years with a $6,000 salvage value. Calculate the accounting rate of return on the machine that Horn Company is considering buying. Enter your answer as a number without the % symbol. For example, if your answer is 10%, simply enter 10 as your answer.