1.

The length, breadth and height of a room is 16 m, 12 m and 20 m respectively. The rate of white washing the four walls is Rs. 5000 per cm2 and the rate of painting the ceiling is Rs. 3 per m2. Find the total cost of painting the room. 1. Rs. 11362. Rs. 5603. Rs. 10364. Rs. 2136

Answer» Correct Answer - Option 1 : Rs. 1136

Given:
Length of a room = 16 m

Breadth of a room = 12 m

Height of a room = 20 m

Rate of white washing = Rs. 5000 per cm2 = Rs. 0.5 per m2

Rate of painting = Rs. 3 per m2

Concept used:

Area of four walls = 2(l + b) × h 

Area of rectangular ceiling = l × b

Cost of painting = Rate × Total area of painting

Calculation:

Area of four walls = 2(16 + 12) × 20

⇒ 2 × 28 × 20

⇒ 1120 m2

Cost of white washing the walls = 1120 × 0.5  

⇒ Rs. 560

Area of ceiling = 16 × 12

⇒ 192 m2

Cost of painting the ceiling = 192 × 3

⇒ Rs. 576

Total cost of painting = 560 + 576 = Rs. 1136

∴ The total cost of painting the room is Rs. 1136.


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