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 (i.e., 30 years after she stopped saving). Her friend Cathy started saving $650 at the end of every year 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 8.5% (compounded monthly) during the entire period?