A shopkeeper sells sugerin such a way that the selling price of 950g of sugar is the same as the cost price of 1 kg of sugar. What is his gain per cent?
Selling price (SP), Cost price (CP)
SP of 950 g = CP of 1000 g
$$ \frac{SP}{CP} = \frac{1000}{950} = \frac{20}{19} $$
gain % = $$ \frac{20 - 19}{19} \times 100 = \frac{100}{19} $$
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