4. Bethlehem corp. borrows $20,000 at 5% and invests in a new machine with a useful life of 5 years. The new Machine generates additional revenues of $10,000/year and additional cost of $2,000/year. The corporation tax rate is 30%. The simple payback period is O. 4.27 YEARS Ob. 3.27 YEARS 3.1 YEARS O d. 4.7 YEARS