The cost of papering the four walls of a room is Rs. 475. Each one of the length, breadth and height of another room is double that of this room. The cost of papering the walls of this new room is :

A. Rs. 712.50

B. Rs. 950

C. Rs. 1425

D. Rs. 1900

Answer: Option D

Solution(By Examveda Team)

$$\eqalign{ & {A_1} = 2\left( {l + b} \right) \times h \cr & {A_2} = 2\left( {2l + 2b} \right) \times 2h \cr & \,\,\,\,\,\,\,\, = 8\left( {l + b} \right) \times h \cr & \,\,\,\,\,\,\,\, = 4{A_1} \cr & {\text{ Required cost}} = {\text{Rs}}{\text{.}}\left( {4 \times 475} \right) \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = {\text{Rs}}{\text{.1900}} \cr} $$