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 $874.28 in8 years.

b. Invest $3,400.00 and receive $11,140.48 in 18 years.

c. Invest $32,571.81 and receive $100,000.00 in 22 years.

d. Invest $34,170.71 and receive $1,300,000.00 in 40 years.

a.What annual rate of return will Keiko earn if she invests $440.00 today and receives $874.28 in 8 years?

nothing % (Round to two decimal places.)