28. The internal measures of cuboidal room are 12m x 8 mx 4m. find the total cost of
white washing all four walls of a rom, i

1 thought on “28. The internal measures of cuboidal room are 12m x 8 mx 4m. find the total cost of<br />white washing all four walls of a rom, i”

1. Answer:

   cost of white washing of four wall is ₹2400.

   cost of white washing of ceiling is ₹1440.

   Step-by-step explanation:

   given:- length=12m

   Breadth=8m

   Height=4m

   so, for four walls,

   Lateral surface area=2(l+b)h

   2(12+8)4

   =2×20×4

   =40×4=160

   so, Lateral surface area is 160m^2.

   Now, let us find the cost of white washing the four walls.

   cost=15×160

   =₹2400.

   so now,

   let us find first the area of ceiling,

   Area of ceiling=length×breadth

   =12×8

   =96m^2.

   Now, cost of white washing of ceiling

   cost=96×15

   =₹1440.

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