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Probability
Question
A bus stop is barricaded from the remaining part of the road, by using 50 hollow cones made of recycled cardboard. Each cone has a base diameter of 40 cm and height 1 m. If the outer side of each of the cones is to be painted and the cost of painting is. र 12 per m2, what will be the cost of painting all these cones? (Use 
= 3.14 and take 
Solution
Base diameter = 40 cm
Base radius (r) = 
cm = 20 cm
= 
Height (h) = 1 m
Curved surface area = πrl
= 3.14 x 0.2 x 1.02 = 0.64056 m2
∴ Curved surface area of 50 cones = 0.64056 x 50 m2 = 32.028 m2
∴ Cost of painting all these cones = 32.028 x 12
= 384.336 = र 384.34 (approximately).
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Some More Questions From Probability Chapter
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(i) Which box has the greater lateral surface area and by how much?
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Mock Test Series
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