A door of dimensions 3 m × 2m is on the wall of dimension 10 m × 10 m. Find the cost of painting the wall if rate of painting is Rs 2.50 per sq. m.

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Solution

We have,
Length of the door = 3 m
Breadth of the door = 2 m
Side of the wall = 10 m
Area of the wall = Side x Side = 10 m x 10 m = 100 m²
Area of the door = Length x Breadth = 3 m x 2 m = 6 m²
Thus,
Required area of the wall for painting = Area of the wall − Area of the door = (100 − 6 ) m²= 94 m²
Rate of painting per square metre = Rs. 2.50
Hence, the cost of painting the wall = Rs. (94 x 2.50) = Rs. 235

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