Question

Find the cost of painting a cuboid of dimensions 20cm×15cm×12cm at the rate of 5 pause per square centimeter ?
Nd the answer given in verification is 72 rupees

Answer 1

$2(20 \times 15 + 15 \times 12 + 12 \times 20) = 1440cmsquare$ also 5*1440is

Answer 2

Answer:

The cost of painting the cuboid is 72 rupees.

Step-by-step explanation:

The dimensions of cuboid are 20cm×15cm×12cm.

The surface area of cuboid is

$A=2(lb+bh+hl)$

The total surface area of cuboid is

$A=2(20\times 15+15\times 12+12\times 20)$

$A=2(300+180+240)$

$A=2(720)$

$A=1440$

The area of cuboid is 1440 cm².

The cost of painting the cuboid is 5 paise per square centimeter.

The cost of painting the cuboid is

$1440\times 5=7200$

The cost of painting the cuboid is 7200 paise.

We know that 100 paise = 1 rupees.

Therefore the cost of painting the cuboid is 72 rupees.