Question

find the cost of painting a cuboid of dimensions 20cm*15cm*12cm at the rate of 5 paisa per square centimeter.

Answer 1

cuboid of dimensions 20cm*15cm*12cm So it's total surface area is 2(l*b+b*h+h*l)

=2(20*15+15*12+12*20)

=2(300+180+240)

=2(720)

=1440cm^2

Rate=rs 0.05

So cost =rate *quantity

=0.05*1440

=rs 72

Answer 2

The cost of painting cuboid is Rs.72

Step-by-step explanation:

Length of cuboid= 20 cm

Breadth of cuboid = 15 cm

Height of cuboid = 12 cm

Area of cuboid = $2(lb+bh+hl)=2(20 \times 15+ 15 \times 12 + 12 \times 20)$

Area of cuboid = 1440 sq.cm.

Cost of painting 1 sq.cm = 5 paisa = Rs. 0.05

Cost of painting 1440 sq.cm = $1440 \times 0.05 = 72$

Hence The cost of painting cuboid is Rs.72

#Learn more:

Find the lateral surface area, total surface area and the volume of a cuboid of dimensions 20m×15m×10m​

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