By selling 20 metres of cloth, a man gains the selling price of 4 metres of cloth. The gain percent is:
Let the Selling Price for 1 m cloth be Re.1
Then, Selling Price for 20 m cloth = Rs.20
Gain = Selling Price for 4 m cloth = Rs.4
Then, Cost Price of 20 m cloth = Rs.20-Rs.4 = Rs.16
Therefore, Required Profit = $$\dfrac{4}{16}\times100 = 25$$%
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