(Ignore income taxes in this problem.) Mercer Corporation is considering replacing a technologically obsolete machine with a new state-of-the-art numerically controlled machine. The new machine would cost $150,000 and would have a sixteen-year useful life. Unfortunately, the new machine would have no salvage value. The new machine would cost $20,000 per year to operate and maintain, but would save $50,000 per year in labor and other costs. The old machine can be sold now for scrap for $15,000. The simple rate of return on the new machine is closest to: (Assume the company uses straight-line depreciation.)