1.

The internal length, breadth and height of a cuboidal room are 12 m, 8 m and 10 m, respectively. The total cost (in Rs.) of whitewashing only all four walls of the room at the cost of Rs. 25 per m2, is:1. Rs. 11,4002. Rs. 18,0003. Rs. 10,0004. Rs. 12,600

Answer» Correct Answer - Option 3 : Rs. 10,000

Given:

Length = 12 m

Breadth = 8 m

Height = 10 m

Cost of 1 m2  wall painting = Rs. 25 

Formula used:

Area of four walls = 2(l + b) × h

Where,

Length = l 

Breadth = b 

Height = h

Calculation:

Area of four walls = 2(l + b) × h

⇒ 2(12 + 8) × 10

⇒ 2 × 20 × 10

⇒ 400 m2

Cost of 1 m2 wall painting = Rs. 25 

Cost of 400 m2 wall painting = Rs. 25 × 400 = 10000

∴ Total cost (in Rs.) of whitewashing only all four walls of the room is Rs. 10000.


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