The cost of painting a cubical box of side 3m at the rate of Rs.2 per sq.m is a) Rs. 120 b) Rs. 112 c) Rs . 108 d) Rs . 125
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The cost of painting a cubical box of side 3m at the rate of
Rs.2 per sq. m is (c) Rs. 108
Step-by-step explanation:
Given,
The side of a cube = 3m
The cost of painting cube = Rs. 2/m²
We have to calculate the area of the cube that will be painted.
Formula for area of cube = 6a²
where a = side of the cube
Putting value of the side of the cube in the formula, we get
Area of cube = 6 (3)²
= 6 X 9
= 54 m²
The cost of painting 54m² of the cube at the rate of Rs. 2/m²
= 54 X 2
= Rs. 108
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