On selling 18 pens at ₹660, there is a profit equal to the cost price of 4 pens. What is the cost price of one pen (in ₹)?
Let's assume the cost price and selling price of each pen is 'cp' and 'sp'.
On selling 18 pens at ₹660, there is a profit equal to the cost price of 4 pens.
18(sp-cp) = 4cp
9(sp-cp) = 2cp
9sp-9cp = 2cp
9sp = 2cp+9cp
9sp = 11cp Eq.(i)
As we know that selling price of 18 pens is 660.
18sp = 660
3sp = 110 Eq.(ii)
Put Eq.(ii) in Eq.(i).
$$3\times110$$ = 11cp
cp = 30
So the cost price of one pen = ₹30
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