1) If the selling price of 50 articles is equal to the cost price of 40 articles, then the loss or gain percent is : A) 20% loss B) 20% gain C) 25% loss D) 25% gain E) 30% gain Answer: Option AExplanation:Let C.P of each article be Re. 1. Then, C.P of 50 articles = Rs. 50; S.P of 50 articles = Rs. 40. $\therefore$ Loss% $=\left(\frac{10}{50}\times 100\right)=20$%
