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A cloth merchant buys cloth from a weaver and cheats him by using a scale which is 10 cm longer than a normal metre scale. He claims to sell cloth at the cost price to his customers, but while selling uses a scale which is 10 cm shorter than a normal metre scale. What is his gain?

a

$20 \%$

b

$21 \%$

c

$22 \frac{2}{9} \%$

d

$23 \frac{1}{3} \%$

Answer : Option B

Explanation :

Profit percent

$=\left(10+10+\frac{10 \times 10}{100}\right) \%=21 \%$