A open box is made of wood 3 cm thick.Its external length,breadth,height are 1.48m,1.16m,8.3dm.Find the cost of painting the inner surface at Rs.50 per square metre.
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l= 1.48m b=1.16m h=8.3dm= 0.83 m
inner tsa = 2(lb+bh+hl)= 2(1.48*1.16+1.16*0.83+0.83*1.48)= 2(1.71+0.96+1.22)= 7.78 m²
cost = Rs(7.78*50)= Rs 389
inner tsa = 2(lb+bh+hl)= 2(1.48*1.16+1.16*0.83+0.83*1.48)= 2(1.71+0.96+1.22)= 7.78 m²
cost = Rs(7.78*50)= Rs 389
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