Question : The length, breadth, and height of a room are 10 m, 8 m, and 6 m, respectively. Find the cost of whitewashing the walls of the room and the ceiling at the rate of 7.50 per m2.
Option 1: Rs. 2220
Option 2: Rs. 1850
Option 3: Rs. 2150
Option 4: Rs. 2000
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Correct Answer: Rs. 2220
Solution : The length, breadth, and height of a room are 10 m, 8 m, and 6 m, respectively. Required Area = Curved Surface Area + Area of Ceiling ⇒ Required Area = [ 2h(l + b) ] + [ l × b ], where h = Height, l = Length, and b = Breadth ⇒ Required Area = [ 2 × 6(10 + 8) ] + [ 10 × 8 ] ⇒ Required Area = [ 2 × 108 ] + 80 ⇒ Required Area = 216 + 80 ⇒ Required Area = 296 m 2 Cost of whitewashing: = Required Area × Rate = 296 m 2 × 7.5 = Rs. 2220 Hence, the correct answer is Rs. 2220.
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