Three years ago, Raman's salary was Rs. 45,000. His salary is increased by 10 percent, A percent and 20 percent in first, second and third year respectively. Raman's present salary is Rs. 83160. What is the value of A?

A. 40

B. 30

C. 50

D. 54

Answer: Option A

Solution(By Examveda Team)

$$\eqalign{ & 10\% = \frac{1}{{10}},\,A\% = \frac{A}{{100}},\,20\% = \frac{1}{5} \cr & 45000 \times \frac{{11}}{{10}} \times \frac{{100 + A}}{{100}} \times \frac{6}{5} = 83160 \cr & 100 + A = 140 \cr & A = 40 \cr} $$