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A trader by means of his false balance d...

A trader by means of his false balance defrauds to the extent of 10% in buying goods and also defrauds to 10% in selling. Find his gain per cent.

A

`21%`

B

`(22)2/9%`

C

`(20)2/9%`

D

`(21)2/7%`

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The correct Answer is:
B
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