Kirk Van? Houten, who has been married for 23 ?years, would like to buy his wife an expensive diamond ring with a platinum setting on their? 30-year wedding anniversary. Assume that the cost of the ring will be ?$12,000 in 77 years. Kirk currently has ?$4,510 to invest. What annual rate of return must Kirk earn on his investment to accumulate enough money to pay for the? ring?