Question

By selling 99 pens, a trader gains the cost of 33 pens.find his gain percentage?

Answer 1

50% gain................

Answer 2

Let 33 pens=x
Thus,
99 pens=3x

When you sell 3x, you gain x.

So, C.P.=S.P. - Gain
$= 3x - 2x \\ = x$

Thus gain %
$= \frac{x}{2x} \times 100 \\ = \frac{1}{2} \times 100 \\ = 50\%$
Hope it helps
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