A shopkeeper cheats to the extent of 10% while buying and selling, by using false weights. His total gain is.  Choose the correct choice from the following answers.
A) 22	B) 21	C) 8	D) 9	E) 81
Answer: 21) 21%
<result>B</result>
A shopkeeper cheats to the extent of 10% while buying and selling, by using false weights. His total gain is.