a number is increased by 25%and then decreased by 20%.find the change in the number
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let the number be x.
when increased by 25%, it becomes 1.25x , and when decreased by 20% it becomes 0.8x .
so the change is 1.25x-0.8×= 0.45x.
if the change is expressed as percentage of the original value it 45%
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