Answer :

Let C.P of pen be x

Loss = x%


If C.P = Rs.100, then loss = Rs. X


And, if C.P = x, then



Also, Loss = C.P – S.P



x2 – 100x + 2400 = 0


x2 – (60 + 40)x + 2400 = 0


x2 – 60x – 40x + 2400 = 0


x – 60 = 0 or x – 40 = 0


x = 60 or x = 40


But given C.P is less than 50


Cost Price(C.P) = Rs.40


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