The cost of preparing the walls of a room 12 m long at the rate of Rs. 1.35 per square metre is Rs. 340.20 and the cost of matting the floor at 85 paise per square metre is Rs. 91.80. Find the height of the room.
Length of room = 12m.
Let height of room be ‘h’ m.
Area of 4 walls = 2 (l + b)x h
According to question
Also area of floor = l x b
`⇒12xxbxx0.85 = 91.80`
Substituting b= 9m in equation (1)
Concept: Surface Area of a Cuboid
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