Question

The floor of a rectangular hall has a perimeter 236 m. Its height is 4.5 m. Find the cost of painting its four walls (doors and windows be ignored) at the rate of 8.40 rupees per square metre.

Answer 1

Given,

Perimeter of Hall = 236 m.

Height = 4.5 m

Perimeter = 2 (l + b) = 236 m

Area of four walls = 2 (l + b) × h

= 236 × 4.5

= 1062 m²

We have, cost of painting 1 m² = ₹8.40

Hence,

Cost of painting 1062 m² = ₹8.40 × 1062 = ₹8920.80

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