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 $450.00 and receive $869.38 in 12 years. b. Invest $3,400.00 and receive $11,041.31 in 17 years. c. Invest $31,631.15 and receive $100,000.00 in 24 years. d. Invest $32,956.36 and receive $1,500,000.00 in 30 years. a. What annual rate of return will Keiko earn if she invests $450.00 today and receives $869.38 in 12 years? % (Round to two decimal places.)