A bookseller sold 39 a 39 number of Geography textbooks at the rate of Rs x per book 39 a 2 39 numbe...........

Math and Mental Ability Simplification

A bookseller sold 'a' number of Geography textbooks at the rate of Rs. x per book, 'a + 2' number of History textbooks at the rate of Rs. (x + 2) per book and 'a - 2' number of Mathematics textbooks at the rate of Rs. (x - 2) per book. What is his total sale in Rs. ?

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