The task is to generate the correct answer for a given math problem.

Q: Problem: if the cost price of 50 articles is equal to the selling price of 40 articles , then the gain or loss percent is ?

A: 25 %
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Q: Problem: the area of a circular field is 17.56 hectares . find the cost of fencing it at the rate of rs . 7 per metre approximately

A: 10400
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Q: Problem: how much is 70 % of 40 is greater than 4 / 5 of 25 ?

A:
****