Metro Construction received $60,000 in vendor financing at 10.5% compounded semi-annually for the purchase of a loader. The contract requires semi-annual payments of $10,000 until the debt is paid off. Suppose that the loan permits an additional prepayment of principal on any scheduled payment date. Prepare another amortization schedule that reflects a prepayment of $5,000 with the third scheduled payment. How much interest is saved as a result of the prepayment?

The Lisbons' new heat pump cost $4,500.They bought it to replace their old furnace and air conditioner which cost about $2,800 a year to run.The heat pump will save them approximately 39% a year.In how many years will the heat pump pay for itself? Round to the nearest tenth.