Question

U. 1 point 8. The cost of plastering the four walls of a room is Rs. 25. The cost of plastering a room twice in length, breadth and height will be A. Rs. 50 B. Rs. 75 C. Rs. 100 D. Rs. 200​

Answer 1

Answer:

Rs 100

Step-by-step explanation:

Area of four walls = 2h(l+b)

Cost of four walls = Rs 25

Therefore, 2h(l+b) = 25

Now if we double the length, breadth and height of the walls then,

Cost will be = 2×2h(2l+2b)

= 4[2h(l+b)]

= 4×25 = Rs 100