The profit percentages on the four books A, B, C and D respectively are 10%, 15%, 20% and 25%. The ratio of the cost prices of the books A, B, C and D is 4 : 6 : 7 : 9, respectively. Also, the ratio of number of copies sold A, B, C and D is 2 : 3 : 1 : 4. Find the overall profit.

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