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A room which is 14 mtr long, 12 mtr wide and 3.5 mtr high has 2 windows of dimensions 3/2m × 2 m and a door of dimensions 3 m × 8/3 m. Find the cost of preparing four walls with paper which is 30 cm wide at the rate of 70 paise per meter.

A room which is 14 mtr long, 12 mtr wide and 3.5 mtr high has 2 windows of dimensions 3/2m × 2 m and a door of dimensions 3 m × 8/3 m. Find the cost of preparing four walls with paper which is 30 cm wide at the rate of 70 paise per meter. Correct Answer Rs. 392

Area of four walls = 2(l + b) × h

⇒ 2(14 + 12) × 3.5 = 182 sqm

Area of 2 windows and a door = 2 × 3/2 × 2 + 3 × 8/3 = 14 sqm

∴ Area of 4 walls that need to be prepared with paper = 182 – 14 = 168 sqm

Length of the paper = 168/0.3 = 560 mtr

Cost of preparing the walls with paper = 560 × (70/100) = Rs. 392

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