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The dimensions of a room are 25 feet * 15 feet * 12 feet. What is the cost of white washing the four walls of the room at Rs. 5 per square feet if there is one door of dimensions 6 feet * 3 feet and three windows of dimensions 4 feet * 3 feet each?

Correct answer: D. Rs. 4530

  • A. Rs. 4800
  • B. Rs. 3600
  • C. Rs. 3560
  • D. Rs. 4530

Explanation

The area of the four walls is 2(25 ft + 15 ft) x 12 ft = 960 sq.ft. Openings occupy 6 ft x 3 ft = 18 sq.ft and 3 x (4 ft x 3 ft) = 36 sq.ft, so the whitewashed area is 960 sq.ft - 54 sq.ft = 906 sq.ft. Cost is 906 sq.ft x Rs.5 per sq.ft = Rs.4,530. Option c usually comes from subtracting the openings incorrectly.

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