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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