Discussed Ben & Abe. Ben contributed $2,000 annually to his retirement account for 31 years totaling $62,000. Abe's contributed $2,000 annually to his retirement account for 10 years totaling $20,000. Both earned the same rate of return - 9% monthly compounding. At retirement at age 65, Ben had over $290,000 in his account while Abe had over $525,000. 

Explain how Ben contributed three times as much money three times as long yet Abe had considerably more money at retirement