Cauwel!
Find the cost of painting a cuboid of dimensions 20cm x 15 cm x 12 cm at the rate of 5
paisa per square centimeter.
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Surface area of cuboid= 2(lb + bh + hl)
= 2( 20*15 + 15*12 + 12*20)
= 2(300+180+240)
=2(720)
= 1440cm Sq.
Cost of painting a cuboid of 1cm Sq = 5p
Cost of painting a cuboid of 1440 cm Sq. = 1440*5
=7200p
=7200/100
= Rs 72
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