# A storekeeper sel

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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