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 $360.00 and receive $650.52 in 9 years. b. Invest $2,600.00 and receive $12,801.83 in 18 years. c. Invest $30,859.68 and receive $120,000.00 in 28 years. d. Invest $31,891.67 and receive $1,300,000.00 in 50 years. a. What annual rate of return will Keiko earn if she invests $360.00 today and receives $650.52 in 9 years? % (Round to two decimal places.)