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N= investment money N+.2N+300-450-500=1700

Liam invested money in the stock market. in the first year his stock increased 20%. he paid his stockbroker $300 and then lost $450. he withdrew $500 and then his remaining investment doubled. Liam's investment is now where to $7100. how much was Liam's original investment
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2(N - 0.2N -300 - 450 - 500) = 7100
- with a couple assumptions not explicitly stated.
N should be 4000.  Check me on that.