Question

The length and breadth of a rectangular wall are 30 metre and 24 metre respectively and the cost of painting the wall is Rs. 3,240. Find the rate of painting per square metre.
1. Rs. 4.2
2. Rs. 4.5
3. Rs. 4
4. Rs. 4.8
5. Rs. 4.4

Answer 1

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.