Answer :

Let the CP of book be x

1st SP = SP at Profit of 15%.




= 0.15x


2nd SP = SP at Profit of 18%




= 0.18x


Also, 2nd SP = 1st SP + 18


0.18x = 0.15x + 18


0.03x = 18



x = 600


CP of book is Rs.600


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