If a man were to sell his chair for Rs. 720, he would lose 25%. To gain 25% he should sell it for:

Answer: Option A

Let the Cost price of the Chair is X.
SP = X - 25% of X
720 = 0.75X
X = 960
CP = Rs. 960
So, To gain 25%, SP would be
= 960 + 25% of 960 =Rs. 1200

Short-cut
CP of chair = $$\frac{100}{75}$$ × 720 = Rs. 960
To gain 25%, SP = $$\frac{125}{100}$$ × 960 = Rs. 1200