An article having marked price, ₹900, was sold for ₹648 after two successive discounts. The first discount was 20%. What was the percentage rate of the second discount?
Let the 2nd discount be x %
According to the question,
$$900\times\frac{80}{100}\times\frac{(100-x)}{100}=648$$
$$1000 - 10x=900$$
$$x=\frac{100}{10}=10$$
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