To find out the amount of interest earned, we have to calculate the future value of the deposits using the future value of annuity equation.
Future value of the deposits in 20 years = $ 1,767,061.25
Amount of interest earned = $ 1,767,061.25 - $ 3000 240 months
Amount of interest earned = $ 1,047,061.25
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Value of the monthly deposits at the end of 7 years is first calculated.
Future value of reinvestment into new account is calculated as follows
Balance at end of 20 years after reinvestment = $ 2,704,854.73
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