Mohan wanted to paint the walls and ceiling of a hall. the dimensions of the hall is 20m # 15m # 6m. find the area of surface to be painted and the cost of painting it at ` 78 per sq. m.
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area=L.S.A.+area of ceiling
2(l+b)×h+lb
2(20+15)×6+20×15
420+300
720
1m sq.=rupees 78
720m sq.=78×729
rupees 56160 ans
2(l+b)×h+lb
2(20+15)×6+20×15
420+300
720
1m sq.=rupees 78
720m sq.=78×729
rupees 56160 ans
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