60% of the cost price of an article is equal to 50% of its selling price. Then the percentage of profit or loss on the cost price is
60% of the cost price of an article is equal to 50% of its selling price
$$ \frac{60}{100} \times CP = \frac{50}{100} \times SP $$
$$ \frac{SP}{CP} = \frac{60 \times 100}{100 \times 50} =\frac{6}{5} $$
profit % = $$ \frac{1}{5} \times 100 = 20$$ %
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