Question
What will it cost to paint four walls of a room of
dimensions 40 ft x25 ft x32 ft at Rs 7 per square foot if the room has two doors of 8 ft x5 ft and two windows of 3 ft x2 ft?Solution
Around the walls of the room, Area = 2x length x height + 2x breadth x height =2×40×32+2x25x32 =2560+1600 = 4160 ft² While this area has two doors and two windows which are on one side of the wall, the area taken on both sides is. Therefore, Total area of doors and windows = 2x (8×5) + 2 x (3x2) = 80+12 = 92 square feet Remaining area. = 4160-92 =4068 square feet The cost of painting all four walls of the room at the rate of Rs 7 per square foot = 4068 ×7 = Rs 28476.
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