# A cloth merchant buys cloth from a weaver and teaches him by using

A cloth merchant buys cloth from a weaver and teaches 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 (2/9)%

(d) 23 (1/3)%