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Q.) The cost of the paint is 36.50 per kg. If 1 kg of paint covers 16 square feet, how much will it cost to paint outside of a cube having 8 feet each side?

(a) 692

(b) 972

(c) 768

(d) 876

Solution :

Side of each side of cube = 8 feet.

A cube has 6 faces . Each face will be square.

Hence , the area of each face of cube = 8*8 = 64 sq feet

Total area of Faces of Cube = 6*64 = 384 sq feet

16 sq feet is covered by 1 kg of paint.

So, 384 sq feet will be covered by $\frac { 384 }{ 16 } $ = 24 kg of paint.

Cost of 1 kg of paint = 36.50 Rs.

Cost of 24 kg of paint =24 X 36.50 Rs. = 876 Rs.

Hence, Option(d)