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 $809.38 in 11 years. b. Invest $3,600.00 and receive $12,833.89 in 15 years. c. Invest $30,702.32 and receive $150,000.00 in 20 years. d. Invest $32,819.77 and receive $1,400,000.00 in 40 years. What annual rate of return will Keiko earn if she invests $450.00 today and receives $809.38 in 11 years? % (Round to two decimal places.)