A dealer buys an article marked at Rs. 25000 with 20% and 5% off. He spends Rs. 1000 for its repair and sells it for Rs. 25000 what is his gain or loss percent ?

Answer: Option B

Marked price of an article = Rs. 25000
After discount, cost price
$$=\text{Rs}\text{. 25000}\times \frac{80}{100}\times \frac{95}{100}$$
= Rs. 19000
After repair, cost price
= Rs. 19000 + 1000
= Rs. 20000
Selling price of an article = Rs. 25000
$$\begin{array}{rl}& \text{Gain}\%\Rightarrow \frac{25000-20000}{20000}\times 100\\ & \text{Gain}\%\Rightarrow \frac{1}{4}\times 100\\ & \text{Gain}\%\Rightarrow 25\%\end{array}$$