Discussion
Find the selling price of an article listed at Rs. 10 on which there are discounts of 20% and 10%.
Answer: A
Successive discounts multiply the retained fractions.
\[ 10 \times (1 - 0.20) \times (1 - 0.10) = 10 \times 0.80 \times 0.90 \]
\[ = 10 \times 0.72 = \text{Rs. } 7.20 \]
The single equivalent discount is 28%, not 30% - the 10% is charged on Rs. 8 rather than on Rs. 10, so it takes off 80 paise instead of one rupee.
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