A cubical box with lid has a length of 30cm find the cost of painting inside and outside of box at₹5.50per meter sq.-question 7
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Length of one side of cubical box is 30cm
Total surface area of cubical box=6×side^2
=6×30^2
=5400cm^2
=0.54m^2
Cost of painting 1m^2= Rs. 5.50
Cost of painting 0.54m^2= Rs. 5.50×0.54
=Rs. 2.97
Cost of painting inside and outside of the box= Rs. 2×2.97
=Rs. 5.94
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