Inferest rato (with changing years). Keiko is looking at the following investmont choicos and wants to know what annual rate of retum each choice produces a. Invest $420.00 and receive $727.18 in 9 years. b. Invest $3,400.00 and recelve $12,477.79 in 14 years. c. Invest $30,068.89 and receive $150,000.00 in 22 years. d. Invost 532,047.35 and receive $1,500,000.00 in 50 years. a. What annual rate of return will Keiko earn if the invests $420.00 today and receives $727.18 in 9 years? 4. (Round to two decimal places)