Question

find the cost of painting a cubiod of dimensions 20cm×15cm×12cm at the rate of 5 paisa per square centimeter

Answer 1

area of the cuboid=2(lb+bh+lh)
area of cuboid =2(20×15+15×12+20×12)
=2×300+180+240
=2×720
=1440cm square
cost for per square cm= 5 paise
cost for 1440 square cm= 1440×5=7200 paise
= 72 rupees

Answer 2

Answer:

Step-byarea of the cuboid=2(lb+bh+lh)

area of cuboid =2(20×15+15×12+20×12)

=2×300+180+240

=2×720

=1440cm square

cost for per square cm= 5 paise

cost for 1440 square cm= 1440×5=7200 paise

= 72 rupees