21. The base of a cubical box has a perimeter 250 m. Find the cost of painting its lateral surface area at the rate of 10 per m ^ 2 .
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Answer:
Rs. 156250
Step-by-step explanation:
Perimeter of square = 4a
4a= 250
a=250/4
A= 62.5
CSA of Cube = 4a^2
4x62.5x62.5
= 15625 m^2
Cost = 15625 x 10
Rs.156250
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