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. ?
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. ? Correct Answer 3ax + 8
Given:
The price of each Geography textbook is x
The price of each History textbook is (x + 2)
The price of each Mathematics textbook is (x - 2)
Calculation:
⇒ Total expenditure on Geography textbook = ax
⇒ Total expenditure on History textbook = (a + 2) × (x + 2) = ax + 2x + 2a + 4
⇒ Total expenditure on Mathematics textbook = (a - 2) × (x - 2) = ax - 2x - 2a + 4
⇒ The total sale = ax + ax + 2x + 2a + 4 + ax - 2x - 2a + 4 = 3ax + 8
∴ The required result will be "3ax + 8".
