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 $400.00 and receive $786.86 in 10 years. b. Invest $3,000.00 and receive $10,927.45 in 15 years. c. Invest $31,180.47 and receive $100,000.00 in 20 years. d. Invest $31,327.88 and receive $1,000,000.00 in 45 years. a. What annual rate of return will Keiko earn if she invests $400.00 today and receives $786.86 in 10 years