Question

amit was given an increment of 20 percent on his salary.if his new salary is rs.30600,what was his salary before the increment?

Answer 1

$120\% \: of \: x = 30600 \\ x = \frac{30600 \times 100}{120} \\ = 25500$

Answer 2

Let Amit's old salary be X Rs.
20% increment on salary will be = X × 20/100 Rs.

According to the given condition,
New salary = old salary + 20 % increment
I.e. 30600 = X + (X × 20/100)
30600 = X + X/5
30600 = 6X/5
Transposing 5 to Left
30600 × 5 = 6X
153000 = 6X
transposing 6 to left
153000/6 = X
25500 = X
Hence Amit's old salary = 25500 Rs.