6. The ratio of the CP and SP of an...
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6. The ratio of the CP and SP of an article is 20:21. What is the gain per cent? (1) 5% (3) 6% (2) 5.5% (4) 6.25%

11th - 12th Class
Maths
Solution
83
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( frac{c p}{s p}=frac{20}{21} ) gain ( %=frac{s P-c P}{c p} times 100 ) ( =frac{s p-frac{20}{21} s p}{frac{20}{21} s p} times 100 ) ( =frac{(21-20)}{20}=frac{(21-20) times 5}{5 %} )
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