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Bunuel
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why can't we use the property of (1+x)^n ≈ (1+nx) when |x| * n < 1 here?

On doing that we get 400(0.16) which obv gives us the wrong ans of 64. How can we use a better method to do (1.04)^4? KarishmaB Bunuel GMATNinja would love some help here.... have my gmat in 12 days :(
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