Kirk Van Houten, who has been married for 21 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 $13000 in 9 years. Kirk currently has $4536 to invest. What annual rate of return must Kirk earn on his investment to accumulate enough money to pay for the ring? Question content area bottom Part 1 The annual rate of return Kirk must earn on his investment to accumulate enough money to pay for the ring is %. (Round to two decimal places.)