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Q4. The internal dimensions of rectangular hall are 15 m × 12 m × 4 m. There are 4 windows each of dimension 2 m × 1.5 m and 2 door each of dimension 1.5 m × 2.5 m. Find the cost of white washing all four walls of the hall, if the cost of white washing is Rs. 5 per m2. What will be the cost of white washing if the ceiling of the hall is also white washed ?
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