Interest rate (with changing years). Keiko is looking at the following investment choices and wants to know what annual rate of return each choice produces. a. Invest $400.00 and receive $716.14 in 12 years. b. Invest $2,800.00 and receive $11,151.58 in 17 years. c. Invest $30,389.99 and receive $110,000.00 in 22 years. d. Invest $31,214.81 and receive $1,400,000.00 in 50 years. a. What annual rate of return will Keiko earn if she invests $400.00 today and receives $716.14 in 12 years? % (Round to two decimal places.)