Question

A cubical box with lid has a length of 30 cm. Find the cost of painting the inside
and outside of the box at 5.50 per m2.
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Answer 1

Answer:

Cost of painting inner SA = Rs. 2.97 = Cost of painting outer SA

Step-by-step explanation:

The cube's inside SA = outside SA as its thickness is not given.

Side = 30 cm = 0.3 m (1 m = 100 cm)

TSA of cube = 6a² where a is its side.

=> 6(0.3)² => 6*0.09 => 0.54 m²

Cost = 5.50/m²

Thus, cost of painting inner SA = 5.50*0.54 => Rs. 2.97 = cost of painting outer SA.