Denny Corporation !

Denny Corporation is considering replacing a technologically obsolete machine with a new state-of-the-art numerically controlled machine. The new machine would cost $600,000 and would have a 10-year useful life. Unfortunatley, the new machine would have no salvage value. The new machine would cost $20,000 per year to operate and maintain, but would save $125,000 per year in labor and other costs. The old machine can be sold now for scrap for $50,000. What percentage is the simple rate of return on the new machine rounded to the nearest tenth of a percent? (Ignore income taxes in this problem)Please show all math and calculations