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CBSE Class 9 Answered

A class Room is 7 m long, 6.5 cm wide, and 4 cm high. It has one door 3m*1.4m and three windows each measuring 2m*1m. The interior wall is to be coloured. Find the cost of of colouring at the rate of Rs.3.50 per sq. m.
Asked by | 27 Feb, 2012, 03:28: PM
answered-by-expert Expert Answer
Complete area of 4 walls = 2(7*4 + 6.5*4) = 108 sq. m
Area of door = 3*1.4 = 4.2 sq. m
Area of window = 3*2*1 = 6 sq. m
Area to be white washed = 108-4.2-6 = 97.8 sq. m
Total cost of white wash = Rs 97.8*3.50 = 342.30
Answered by | 27 Feb, 2012, 04:36: PM

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