Acadia Co. has a machine that costs $280,000. The machine will be depreciated on a straight-line basis to a zero book value over their eight-year life. The machine is expected to generate net income of $20,000 a year for the first four years and $10,000 a year for the last four years. What is the average accounting rate of return? 14.44 percent 12.50 percent 16.08 percent 10.71 percent