Question

A cubical box with lid has lenght of 30 cm . Find the cost of painting the inside and the outside of the box at ₹ 5.50 per m² ? ​

Answer 1

Answer:

We have to find the surface area of the cubical box.

Surface area of the cube = 6a² where a = 30 cm

⇒ 6*30*30

⇒ 5400 sq cm

As the cubical box has to be painted both from the outside and inside.

So, the total surface area = Inner surface area + outer surface area

⇒ 5400 + 5400

= 10800 sq cm

As we know that 1 sq m = 10000 sq cm

Surface area in sq m = 10800/10000

Surface area in sq m = 1.08 sq m

Cost of painting the cubical box = Rs. 5.50 per sq m

Total cost of painting = 5.5*1.08

Total cost = Rs. 5.94

So, the total cost of painting the cubical box from outside and inside is 5.94

Step-by-step explanation:

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Answer 2

Answer:

your answer :

Area to be painted = Inside of the box + outside of the box

total painting area = total surface area of inside +

total surface area of outside

= 6a² + 6a²

= 12a²

$= 12( {30}^{2} ) = 12 \times 900 \\ \\ = 10800 \: {cm}^{2} \\ \\ = \frac{10800}{100 \times 100} \: {m}^{2}$

$= \frac{108}{100} = 1.08 {m}^{2}$

1m² painting cost = ₹5.50

1.08 m² painting cost = 1.08 × 5.50 = ₹5.94

Step-by-step explanation:

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