Question

a cubical box with lid has a length of 30cm. find the cost of painting the inside and outside of the box at rs5.50 per m^2

Answer 1

Cubical box ⇒ all sides are the equal

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STEP 1: Find the area of 1 side:

Area = Length x Length

Area = 30 x 30 = 90 cm²

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STEP 2: Find the total area to be painted:

Since we are painting the inside and outside, there is a total of 12 faces to be painted.

1 face = 90 cm²

12 faces = 90 x 12 = 1080 cm²

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STEP 3: Find cost:

1 m² = Rs 5.50

1080 cm² = 5.5 x 1080 = Rs 5940

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Answer: The total cost is Rs 5940