Susan saved $500 at the end of every month in her retirement account for 10 years (during age 25-35) and then quit saving However, she did not make any withdrawal until she turned 65 (e, 30 years after she stopped saving). Her friend Cathy started saving $650 at the end of every month for 30 years during age 35-65. What will be the difference in accumulated balances in their retirement accounts at age 65 if both earned an average return of 8% (compounded monthly) during the entire period?
a $235,305
b $121.015
c $562,479
d $31,591