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A petrol tank is in the form of a frustu...

A petrol tank is in the form of a frustum of a cone of height 20 m with diameters of its lower and upper ends as 20 m and 50 m respectively. Find the cost of petrol which can fill the tank completely at the rate of Rs. 70 per litre. Also find the surface area of the tank

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To solve the problem step by step, we will first calculate the volume of the frustum of the cone, then the cost of petrol to fill the tank, and finally the surface area of the tank. ### Step 1: Calculate the radii of the frustum - **Given**: - Diameter of the lower end = 20 m - Diameter of the upper end = 50 m - **Calculating the radii**: ...
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