need a b c and d please, thanks

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 $675.44 in 8 years. b. Invest $2,800.00 and receive $12,975.65 in 17 years. c. Invest $30,961.57 and receive $140,000.00 in 26 years. d. Invest $32,378.42 and receive $1,300,000.00 in 45 years. a. What annual rate of return will Keiko earn if she invests $440.00 today and receives $675.44 in 8 years? % (Round to two decimal places.)