Question

the length breadth and heigth of a cuboid are 20cm,15cm,and12sm respectively.find the cost of painting the cuboidat the rate of 5 paise per sq.cm.

Answer 1

dimensions of a cuboid
l= 20cm
b=15cm
h=12cm
total surface area of the cuboid = 2[lb+bh+lh]
=2[20*15+15*12+20*12]
=2[300+180+240]
=2[720]
=1440 sq cm
painting the 1 sq cm = Rs 5 paise
cost of 1440 sq cm = 5*1440=paise7200= Rs 72