A shopkeeper cheats to the extent of 10% while buying as well as selling, by using false weights . Find his total gain.

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14%

11%

21%

answer is D.

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Detailed Solution

It is given a shopkeeper cheats to the extent of 10% while buying as well as selling.
So let, while buying Rs paid for n items.
But Rs made a gain of 10% .
Thus Rs. received

1.1 x

items.
Now on selling again Rs.

1.1 (1.1 x) = 1.21 x

So, the net profit Rs moles =

(\frac{1.21 x}{x} - 1) \times 100 %

\Rightarrow 21 %

Hence, the correct option is (4) .

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