percentage problem.. from GMAT prep

Let the weight of the candy bar was 100 gm and Price was $ 100. per gm price = $ 1/gm

Reduced weight = 80 gm, but the price of the bar is still $ 100.
New per gm price = 100/80 = $ 1.25.

% increase in price (from 1 to 1.25) = 25%

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