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A shopkeeper cheats to the extent of 10%...

A shopkeeper cheats to the extent of 10% while buying as well as selling by using false weights.His total gain is:

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Let shopkeeper buy 100 units with normal weights.
Let price of each unit is `1` rupee.
As he is cheating to the extent of `10%` while buying, he will buy `= 100**(100+10)/100 = 110` units
So, in `100` rupees, he will buy `110` units.
Now, when he is selling these `110` units, again he is getting `10%` gain.
So, selling price in rupees ` = 110**(100+10)/100 = 121`
So, his total gain in rupees` = 121-100 = 21`
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