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By selling 33 litres of milk, one gains the selling price of 11 litres. Find the gain in percentage :

Selling 33 litres gives a gain equal to the selling price of 11 litres, so \(33\,SP - 33\,CP = 11\,SP\), which means \(33\,CP = 22\,SP\). The gain on 33 litres is \(11\,SP\)…

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By selling 33 litres of milk, one gains the selling price of 11 litres. Find the gain in percentage :

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Selling 33 litres gives a gain equal to the selling price of 11 litres, so 33 SP−33 CP=11 SP33\,SP - 33\,CP = 11\,SP, which means 33 CP=22 SP33\,CP = 22\,SP. The gain on 33 litres is 11 SP11\,SP and the cost is 22 SP22\,SP. Hence the gain percentage is 1122×100=50%\frac{11}{22} \times 100 = 50\%.

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