Question

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

Answer 1

$\textbf{Answer:}$

Area of the cuboid =2(lb+bh+hl)

Area of the cuboid=2(20x15+15x12+12x20)

Area of cuboid=2(300+180+240)

=2x720

=1440cm²

Cost of per cm²= 5 paise

Cost of 1440 cm²=1440x5=7200 paise

7200 paise=72 rupees

$\boxed{72 rupees}$

$\textbf{Hope it helps you!}$

Answer 2

Dimension of cuboid are=20×15×12cm
Total area=20×15×12cm
=3600cm
Cost of painting 1cm=5paise
1rupee=100paise
Then,
Cost of painting 3600cmsquare=3600/2
=1800
Hence, cost of painting 3600cm square is 1800 rupees