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the area to be white washed
= Lateral surface area of the room + Ceiling area
= 2(l+b)*h + lb
= 2*3(5+4)+5*4
= 6*9 +20
= 76 m^2
Cost = Rate * Area
= 76 * 7.5
= Rupees 570.
= Lateral surface area of the room + Ceiling area
= 2(l+b)*h + lb
= 2*3(5+4)+5*4
= 6*9 +20
= 76 m^2
Cost = Rate * Area
= 76 * 7.5
= Rupees 570.
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