Question

The salary of worker is first incresed by 30% amd afterwords reduce by 30%. What is net changes in his salary

Answer 1

Hi friend!

The net changes in his salary is -9%
That is, his salary is totally reduced by 9%

30% hike on 100% is 130%

30% deduction on 130% taken as a whole, ie: 100% is

On 100 it is a 30 reduce, so on 130 how much?

$= \frac{30 \times 130}{100}$
$= 39\%$
And
$130\% - 39\% = 91\%$

That's a -9% change in his salary as
$100\% - 91\% = 9\%$

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