A dishonest dealer purchases goods at 20% discount of the cost price of Rs. X and also cheats his wholesaler by getting 20% extra through false weighing, per kg. Then he marks up his goods by 80% of x, but he gives a discount of 25% besides he cheats his customer by weighing 10% less than the required. What is his overall profit percentage?

Answer: Option A

Let actual cost price of an article be Rs. 1 (in place of X). Now he purchases goods worth Rs. 120 and pays Rs. 80, since 20% discount is allowed.
So, the CP = $$\frac{80}{120}=\frac{2}{3}$$
Again, MP, SP = 135 (since 25% discount)
Thus, the trader sells goods worth Rs. 90 instead of 100g and charges Rs. 135.
Therefore the effective SP = $$\frac{135}{90}=\frac{3}{2}$$
$$\begin{array}{rl}& \text{Profit}\%\\ & =\frac{\frac{3}{2}-\frac{2}{3}}{\frac{2}{3}}\times 100\\ & =125\%\end{array}$$