If the cost price of 24 pens is equal to the selling price of 18 pens,find the profit per cent.
24 CP = 18 SP
Then$$\frac{SP}{CP}=Â \frac{24}{18}$$
$$\frac{SP}{CP}= \frac{24}{18}$$ means SP = 4 and CP = 3
so loss % =$$\frac{3-4}{3}100$$
 33.33%
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