An article listed at Rs.65 was bought for Rs.56.16 after two successive discounts, of which, the first is 10%. What is the second discount?
$$ 65 \times \frac{90}{100} \times \frac{100-x}{100} = 56.16 $$
$$ 65 \times 90 \times (100-x) = 561600 $$
$$ 5850 \times (100-x) = 561600 $$
solving,
x = 4%
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