 Hi, and welcome to this session. Let us discuss the following question. The question says the slant height in base time meter of a conical tube are 25 meters and 14 meters respectively. Find the cost of white washing its curved surface at the rate of rupees 210 per 100 meter square. Let's now begin with the solution. In the question we are given that slant height, that is, air of conical tube is 25 meters. Base diameter is 14 meters. As base diameter is equal to 14 meters, therefore radius, that is, r is equal to 7 meters. In this question, we have to find the cost of white washing its curved surface at the rate of rupees 210 per 100 meter square. So now we have to find curve surface area of conical tube. This area of conical tube is equal to pi rl. Now, substitute the value of pi r in l. Pi is equal to 22 by 7. r is equal to 7. l is equal to 25 meters square. And this is equal to 550 meters square. In the question, it is given that cost of white washing 100 meters square of conical tube, rupees 210. Now, this implies cost of white washing 1 meter square of conical tube, rupees 210 per 100. And this implies cost of white washing 550 meters square of conical tube, rupees 210 upon 100 into 550. And this is equal to rupees 1155. Hence, our required answer is rupees 1155. So this completes the session. Bye and take care.