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let the salary be x
on increasing salary by 10%
new salary = x+x×10/100
= 110x/100
=11x/10
salary increased by = 11x/10 -x
= x/10
we must decrease x/10 from 11x/10 to make it original salary
decrease in percentage = (x/10)/(11x/10)×100
= x/10×10/11x×100
= 100/11
= 9(1/11)
hence we decrease salary be 9 1/11% to make it original
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