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A conical tomb's slant height and base diameter are 25 and 14 meters, respectively. Calculate the cost of white-washing its curved surface at 210 per 100 $m 2$ .

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Rs. 1155

Rs 1250

Rs 1600

Rs 1750

answer is A.

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Detailed Solution

Given that,
Height of cone = 25 m
Base of cone = 14 m
Curved surface area of the cone (CSA),

C S A = π r l ⇒ C S A = 227 × 7 m × 25 m ⇒ C S A = 550 m 2

Now,
Rs.210 per 100

m 2

is the cost for white-washing,
So the cost for 550

⇒ Cost = R s 210 100 m 2 × 550 m 2 ⇒ Cost = R s 1155

So Rs. 1155 is the cost of white-washing conical tomb curved surface at the rate of 210 per 100

m 2

.
Therefore the answer is option (1).

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