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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