Discussion

Explanation:

Let the original salary of man be x.

After increase by 10% of x, the new salary is 1.1x

A deduction of new salary by 10% means

0.9 (1.1 x) = 0.99x

⇒ 1% decrease

Alternately,
Net change = 10 - 10 + $\frac{10\times -10}{100}$ = -1%

Alternately,
When a number is increased by p% and then successively decreased by p% (or vice-versa), the net % change is $-\frac{p^2}{100}\%$.

Here, net % change = $-\frac{{10}^2}{100}\%$ = -1%

Hence, option (c).

» Your doubt will be displayed only after approval.