You Want to Be a Millionaire When You Retire in 30

You want to be a millionaire when you retire in 30 years and expect to earn 8.5 percent, compounded monthly. How much more will you have to save each month if you wait 10 years to start saving versus if you start saving at the end of this month? 

A) $947.22 
B) $1,046.80 
C) $808.47 
D) $841.15 
E) $989.10