Question

A cubical box with lid has a length of 30 cm. Find the cost of painting inside and outside of the box at the rate of 5.50 per square metre

Answer 1

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total surface area of cube
=6× side^2
given......
side = 30cm =0.3 m
if box are closed ..
then......
S.A of inside = S.A OF outside
total surface area of box
to be pented....
S.A of inside + S.A OF outside
= 2×6× side^2
= 12× (0.3)^2
= 1.08 m^2
now cost of painting..
= 5.50×1.08
=5.94 rupees...
answer......
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