Sylvia invested $500 in an account compounded annually with an interest rate of 8%. Manuel invested $600 in an account with a compound interest rate of 7.25%. Using the rule of 72, StartFraction 72 Over t EndFraction, who will double their money first? Sylvia will double her money first, in approximately 9 years. Manuel will double his money first, in approximately 10 years. Manuel will double his money first, in approximately 9 years. Sylvia will double her money first, in approximately 10 years.