Find the total cost of the paiting the walls, at the rate of INR 3 per Sq. meter, of the room with the length of 10 meter, width of 7 meter and height of 5 meter, which has two doors with dimention of 1 meter by 3 meter, a big window with dimention of 2 meter by 1.5 meter and two small window 1 meter by 1.5 meter.
Option:
A. INR 474
B. INR 510
C. INR 684
D. INR 894
Answer: A . INR 474
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Justification:
Area of 4 walls = 2 * (L + B) * H = 2 (10 + 7) * 5 = 170 Sq. meter
Total area of doors = 2 * l * b = 2 * 1 * 3 = 6 Sq. meter
Total area of winows = (l * b) + 2 * (l * b) = (2 * 1.5) + 2 * 1 * 1.5 = 6 Sq. meter
Total area, which needs to be painted = 170-6-6 = 158 Sq. meter
Total cost for painting = 158 * 3 = 474 INR.
