21.
A seller uses faulty weight in place of a 2 kg weight and earns a 25% profit. He claims that he is selling on the cost price in front of the customers but uses a faulty weight. How much error is there in the 2 kg weight to gain 25%?

22.
Abhi bought two articles for Rs. 624. He sold one at a loss of 14% and the other at a profit of 14%. If the selling price of both the articles is equal. Then the difference between their cost prices (in Rs.) is:

23.
A shopkeeper bought 60 pencils at a rate of 4 for Rs. 5 and another 60 pencils at a rate of 2 for Rs. 3. He mixed all the pencils and sold them at a rate of 3 for Rs. 4. Find his gain or loss percentage.

24.
A tea seller used to make 50% of profit by selling tea at Rs. 9 per cup. When the cost of ingredients increased by 25%, he started selling tea at Rs. 10 per cup. What is his profit percentage now?

25.
A man sells his goods at a certain price, 20% of which is his profit. If the price at which he buys the goods increases by 10% and he sells them at an 8% higher price, then what will be his profit percent (correct to one decimal place)?

27.
A shopkeeper advertises for selling cloth at 7% loss. However, by using a false scale of length 1 metre he actually gains 24%. What will be the actual length he uses instead of 1 metre?

28.
A person's salary was decreased by 50% and subsequently increased by 50% and then again increased by 100%. How much percentage does he loss or gain?

30.
A businessman cheats by using faulty weights, to the tune of 12% each time, when buying and selling material. What is the rise in his profit percentage using faulty weights only?

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