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 $440.00 and receive $817.61 in 9 years. b. Invest $3,200.00 and receive $11,290.99 in 16 years. c. Invest $32,779.74 and receive $150,000.00 in 22 years. d. Invest $31,424.15 and receive $1,400,000.00 in 30 years. a. What annual rate of return will Keiko earn if she invests $440.00 today and receives $817.61 in 9 years? % (Round to two decimal places.)