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Answer :

Given :

Slant height (l) of conical tomb = 25 m

Base radius (r) of tomb = \(\frac{14}{2} = 7 m\)

We know, CSA of tent = \({\pi}rl\)

= [\(\frac{22}{7} × 7 × 25 m\)]

= [\(22 × 1 × 25 m\)]

= \(550 {m}^2\)

Now, we know that,

Cost of white-washing 100 \({m}^2\) area = Rs. 210

So, Cost of white-washing 550 \({m}^2\) area

= Rs. [\(\frac{210 × 550}{100}\)]

= Rs. 1155

Therefore, it will cost of Rs. 1155 while white-washing such a conical tomb.

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