Correct Answer - Option 2 : Rs. 4.5
Given:
Length of wall = 30 metre
and Breadth of wall = 24 metre
The total cost of painting = Rs. 3,240
Formula used:
Area of a rectangle = Length × Breadth
Calculation:
Let the rate of painting per square metre be Rs. x.
Then, (Area of the wall) × Rate = Total cost
⇒ 30 × 24 × x = Rs. 3,240
⇒ 720x = Rs. 3,240
⇒ x = Rs. 4.5
∴ The rate of painting per square metre is Rs. 4.5.