Question : A seller uses a faulty weight in place of a 2 kg weight and earns a 25% profit. He claims that he is selling at 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%?
Option 1: 250 gm
Option 2: 400 gm
Option 3: 500 gm
Option 4: 300 gm
Correct Answer: 400 gm
Solution :
Let the error be m gm.
Percentage profit =
According to the question,
∴ The faulty weight used by the seller has the error of 400 gm.
Hence, the correct answer is 400 gm.