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I bus stop is barricadoed from the remaining pun of the rusal, by wing S0 hollow ones made of necycled from the remaining pan of the ruast by wing S0 hollow m. If the putcr side of each of the cones is to be painted and the cout op in and take 12 per $m^{2}$ . What will be the cost of painting all these conves? (Ur $π = 3.1 +$ and take $04 = 1.02$

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The radius and slant height of a cone are 5cm and 20cm respectively. Find its curved surface area.

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