Four years ago, you opened a mutual fund account and made three deposits ($200 four years ago, $X three years ago, and $300 a year ago) where you earned varying interest rates according to the diagram that follows. Today your
balance shows $1,000. Determine the amount of the deposit made three years ago ($X).

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F = $1,000 6% 8% 12% 15% -4 -2 -1 $200 $300