A cubical box with lid has a length of 30 cm. Find the cost of paintin

1.	A cubical box with lid has a length of 30 cm. Find the cost of painting the hidsand outside of the box at 5.50 per m2
Answer» We have to find the surface area of the cubical box. Surface area of the cube = 6a² where a = 30 cm ⇒ 63030 ⇒ 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

A cubical box with lid has a length of 30 cm. Find the cost of painting the hidsand outside of the box at 5.50 per m2

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