A conference hall is 14 m long,8 m wide and 4 m height there was four window and one door in it.that don't measure 1 metre by 2 and each window measure 1 metre by 1.5 metre.
a. how many litres are need to paint all the walls of the hall if one litre is enough for covering 18m²
b. what will be the cost of painting the whole if 1 litre cost rupees 225?
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