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The slant height and base diameter of conical tomb are 25m and 14 m respectively. Find the cost of white-washing its curved surface at the rate of Rs. 210 per 100 m². (Assume π = 22/7)

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Detailed Solution

Given, Slant height, l = 25 m and diameter = 14 m

Base radius, r = diameter/2 = 14/2 m = 7m

We know that the CSA of the cone = πrl

Using formula,

CSA = (22/7)×7×25 = 550

CSA of conical tomb= 550m²

Cost of white-washing 100 m² area = 210 Rs

Therefore cost of white-washing 550 m² area = (210×550)/100

= Rs.1155

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