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A comment on 96-Year-Old Secretary Quietly Amasses Fortune, Then Donates $8.2M. Parent comment
FV = PV * (1 + i) ^ t
FV and PV are in dollars, i is a percent, and t is number of years.
We know FV, i and t and can solve for PV.
8,200,000 = PV * (1 + 0.07) ^ 70
PV = 8,200,000 / 1.07 ^ 70
So 72,000 compounded over 70 years at an interest rate of 7% has a future value of 8,200,000.
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FV = PV * (1 + i) ^ t
FV and PV are in dollars, i is a percent, and t is number of years.
We know FV, i and t and can solve for PV.
8,200,000 = PV * (1 + 0.07) ^ 70
PV = 8,200,000 / 1.07 ^ 70
So 72,000 compounded over 70 years at an interest rate of 7% has a future value of 8,200,000.