Discussion
There is a 10% discount on a dozen pairs of trousers marked at Rs. 8000. How many pair of trousers can be bought with Rs. 2400?
Answer: C
Find the discounted price of the dozen first, then the price of one pair.
\[ \text{price of 12 pairs} = 8000 \times 0.90 = \text{Rs. } 7200 \]
\[ \text{price of 1 pair} = \frac{7200}{12} = \text{Rs. } 600 \]
\[ n = \frac{2400}{600} = 4 \]
Dividing Rs. 2400 by the undiscounted unit price of \( 8000/12 = 666.67 \) gives 3.6, which rounds down to 3 - the discount must be applied before the division, not after.
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