Ankit was given an increment of 10% on his salary.

Let the initial salary be Rs $x$.

We know that:

Salary before increment $+$ increment given on salary $=$ new salary

$\therefore x+10 \%$ of $x=3575$

$\Rightarrow x+\frac{10}{100} x=3575$

$\Rightarrow 100 x+10 x=357500$

$\Rightarrow 110 x=357500$

$\Rightarrow x=\frac{357500}{110}$

$\Rightarrow x=3250$

$\therefore$ Salary before increment $=$ Rs 3,250