41.
A vegetable vendor sold 1 kg of potatoes for Rs. 25 and earned 25% profit. In the evening, he started selling potatoes with only 10% profit. At what cost (in Rs.) per kg did he sell the potatoes in the evening?

42.
A dishonest trader says to customers that he sells his goods at a cost price, but he uses a false weight and gains 12.5% as profit. How many grams does he use to weigh 1 kg?

43.
The cost prices of two articles A and B are in the ratio 4 : 5. While selling these articles, the shopkeeper gains 10% on article A and 20% profit on article B, and the difference in their selling prices is Rs. 480. Find 30% of the total cost price (in Rs.) of both the articles.

46.
In a medical transaction, 17 times the cost price is equal to 8 times the sum of the cost price and the selling price. What is the gain or loss percentage?

47.
A shopkeeper bought 120 quintals of wheat. 20% of it was sold at 25% loss. At what percent gain should he sell the rest to gain 25% on the whole transaction?

49.
A shopkeeper claims to sell his articles at Rs. 20 per kg which cost him Rs. 23 per kg. But while selling, he uses a false weight and gives only 800 gm instead of 1 kg. What is his profit percentage?

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