A petrol tank is in the form of a frustum of a cone of height 20m with diameters of its lower and upper ends as 20m and 50m, respectively. Find the cost of petrol which can fill the tank completely at the rate of ₹70 per litre. Also find the surface area of the tank.
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The cost of petrol which can fill the tank completely at the rate of ₹70 is ₹1, 42,99,99,900
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