(Ignore Income Taxes in This Problem

(Ignore income taxes in this problem.) Denny Corporation is considering replacing a technologically obsolete machine with a new state-of-the-art numerically controlled machine.The new machine would cost $450,000 and would have a ten-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 $100,000 per year in labor and other costs.The old machine can be sold now for scrap for $50,000.The simple rate of return on the new machine is closest to:

A) 8.75%
B) 20.00%
C) 7.78%
D) 22.22%