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Ques:9 A number is increased by 30% and then decreased by 30%. Find the
percentage change in the number?
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Answer:
let the number be x
first increase by 30%
x + 30% of x
= x+3x/10
= 13x/10
then decrease by 30%
13x/10 - 30% of 13x/10
=13x/10 - 39x/100
=(130x -39x)/100
=91x/100
total decrease= x - 91x/100
= (100x-91x) /100
= 9x/100
decrease %= (9x/100)/x *100
= (9/100) * 100
= 9% Decrease Answer
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