A person's salary was decreased by 50% and subsequently increased by 50% and then again increased by 100%. How much percentage does he loss or gain?

A. Loss of 40%

B. Gain of 50%

C. Gain of 25%

D. Loss of 10%

Answer: Option B

Solution(By Examveda Team)

$$\eqalign{ & {\text{Let salary}} = 100 \cr & {\text{Then, }}100 \times \frac{{50}}{{100}} \times \frac{{150}}{{100}} \times \frac{{200}}{{100}} = 150\% \cr & {\text{Gain}} = 150 - 100 = \boxed{50\% } \cr} $$