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

$420.00

and receive

$762.72

in

12

years.b.Invest

$3,400.00

and receive

$12,694.72

in

16

years.c.Invest

$30,556.39

and receive

$120,000.00

in

20

years.d.Invest

$33,288.72

and receive

$1,200,000.00

in

50

years.

a.What annual rate of return will Keiko earn if she invests

$420.00

today and receives

$762.72

in

12

years?

nothing%

(Round to two decimal places.)