The bookkeeper

The bookkeeper bought 45 copies of fairy tale books for CZK 120 and 65 copies of the encyclopedia for CZK 325. then he sold it in his shop like this: fairy tales for 135 CZK and encyclopedias for 360 CZK. What was the purchase price of the books? And the selling price of books? What was the bookseller's earnings?

Correct result:

v =  2950 Kc

Solution:

v=45⋅ (135−120)+65⋅ (360−325)=2950 Kc

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