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?

______% (Round to two decimal places.)

b.What annual rate of return will Keiko earn if she invests $3,000.00 today and receives $10,927.45 in 15 years?

______% (Round to two decimal places.)

c.What annual rate of return will Keiko earn if she invests $31,180.47 today and receives $100,000.00 in 20 years?

_____% (Round to two decimal places.)

d.What annual rate of return will Keiko earn if she invests $31,327.88 today and receives $1,000,000.00 in 45 years?

_____% (Round to two decimal places.)