a number is increased by 20% and then decreased by 20%. find the net increase or decrease per cent
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let the number be x.
when increased by 20% it becomes 1.2x.
when this is decreased by 20%, it becomes 1.2 (0.8)x = 0.96x.
so it is decreased.
the decrease is 0.04x
. that is 4%
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