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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 $612.31 in 10 years. b. Invest $3,800.00 and receive $12,498.02 in 18 years. c. Invest $30,638.73 and receive $150,000.00 in 28 years. d. Invest $31,960.48 and receive $1,400,000.00 in 45 years. a. What annual rate of return will Keiko earn if she invests $400.00 today and receives $612.31 in 10 years? % (Round to two decimal places.) Waiting period. Jamal is waiting to be a millionaire. He wants to know how long he must wait if a. he invests $24,367.84 at 20% today? b. he invests $51,255.34 at 14% today? c. he invests $131,553.88 at 8% today? d. he invests $334,379.35 at 7% today? a. How long will Jamal have to wait to become a millionaire if he invests $24,367.84 at 20% today? years (Round to the nearest whole number.)