Question

( 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 %} )

# 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%

Solution