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The slant height and base diameter of a conical tomb are 25 m and 14 m respectively. Find the cost of white-washing its curved surface at the rate of Rs.210 per 100 m2.

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Rs. 1500

Rs. 2100

Rs. 1155

Rs. 1200

answer is A.

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Detailed Solution

Given, base diameter of a conical tomb = 14m.
We know the radius is half of the diameter.
So, radius of the base of the conical tomb =

⇒ D i a m e t e r 2 ⇒ 142 ⇒ 7 m

Given, Slant height of the conical tomb l = 25 m.
Curved surface area of the conical tomb =

π r l

⇒ 227 × 7 × 25

⇒ 550 m 2

So, cost of white-washing is curved surface area

\times

Rs.210 per 100 m2.
Cost of white-washing

= 550 \times 210

⇒

Rs. 1155 Therefore, the correct option is 1.

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