a number is increased by 20% and then it is decreased by 20 %. find the net increase or decrease per cent
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let number be x
increased number =120%of x =120/100x=6x/5
then decreased number=80%of 6x/5
=6x/5×80/100
net decrease=x-24x/25= x/25
net percentage =x/25×1/x×100%=4%
increased number =120%of x =120/100x=6x/5
then decreased number=80%of 6x/5
=6x/5×80/100
net decrease=x-24x/25= x/25
net percentage =x/25×1/x×100%=4%
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