For a Long Time, Sally Has Been Investing $7,000 at the End

Multiple Choice

For a long time, Sally has been investing $7,000 at the end of every six months. The value of her savings today is $2,500,000. She has made wise investment decisions and has earned a return of 16.4% compounded semi-annually. How long ago (rounded off to the nearest whole year) did Sally start this savings plan?

A) 17 years
B) 22 years
C) 27 years
D) 32 years
E) 41 years