(Related to Checkpoint 5.6) (Solving for) 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 $11,000 in 7 years. Kirk currently has $4,511 to invest. What annual rate of return must Kirk earn on his investment to accumulate enough money to pay for the ring? C 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.)