Answer :

Given that, cost price of some pencils = Rs.3 and for other equal no. of pencils = Rs.3 and total selling price = Rs.7.

Let lady buys ‘n’ pencils for Rs.3.(type - 1)

And for ‘n’ pencils of other kind, she paid Rs.6(type - 2)

she sold n + n = 2n pencils for Rs.7

Now, for type - 1 pencils -

Gain = selling price - cost price

Now, for type - 2 pencils -

Loss = cost price - selling price

Net gain % = Gain % - Loss %

= 25%

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