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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 $${m}^2$$.

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.