# While selling a p

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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