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A storage tank consists of a circular cylinder with a hemisphere adjoined on either end. If the external diameter of the cylinder be 1.4 m and its length be 8 m, find the cost of painting it on the outside at the rate of Rs 10 per m²? (Wait, volume question requested). Find the volume of the tank.

A13.75 m³

B12.32 m³

C15.4 m³

D10.5 m³