Discussion
The ratio of cost price and selling price of an article is 20 : 21. Then the profit per cent on it is
Answer: D
The profit is 5%.
If CP : SP = 20 : 21, take CP = 20 and SP = 21; the profit is 1 on a cost of 20.
\[ \text{profit}\% = \frac{1}{20} \times 100 = 5\% \]
Working the profit out on the selling price would give \(\frac{1}{21} \times 100 \approx 4.76\%\), not an option; 6¼%, 8% and 10% fit no step.
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