Clearlake Optical has developed a new lens. The owners plan to issue a $8,000,000 30-year bond with a contract rate of 7.5% paid annually to raise capital to market this new lens. This means that Clearlake will be required to pay 7.5% interest each year for 30 years. To pay off the debt, Clearlake will also set up a sinking fund paying 8% interest compounded annually. What size annual payment is necessary for interest and sinking fund combined