A cubical box without a lid has a length of 30 centimeter. Find the cost of painting the inside and outside of the box at rupees 5.50 per metre square.
MrCoder:
4.95
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The box is without a lid
⇒ number of faces to paint = 10
Convert 30 cm to m:
30 cm = 0.3m
Find the area of 1 face:
area = length x length
area = 0.3 x 0.3 = 0.09 m²
Find the area of 10 faces:
1 face = 0.09 m²
10 faces = 0.09 x 10 = 0.9 m ²
Find the cost of the painting:
1 m² = Rs 5.50
0.9 m² = 5.5 x 0.9 = Rs 4.95
Answer: The cost of painting is Rs 4.95
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