A box with lid is in the form of a cuboid.its length,breadth,and height are respectively 1 m 30 cm,75 cm and 20 cm. Find the cost of painting is outer surface at the rate of ₹4per cm
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the box with lid is in the form of a cubiod
it's length = 1m 30 cm
1m = 100 cm
1 ×100 + 30
130 cm
it's breadth = 75 cm
its height = 20 cm
the surface area of cubiod = 2(hl +bl+ bh)
= 2 ( 20 ×130 + 75 ×130 + 75 ×20 )
= 2 ( 13850 )
= 2× 13850
= 55400 cm .sq
the cost pf painting outer surface area
= 4× 55400
= 221600 Rs per cm .sq
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