A bookseller sold 'a' number of Geography textbooks at the rate of Rs.

1.	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. ? 1. 3x + 3a2. 3ax + 83. 9ax4. x3a3
Answer» Correct Answer - Option 2 : 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".

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. ? 1. 3x + 3a2. 3ax + 83. 9ax4. x3a3

Answer» Correct Answer - Option 2 : 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".

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