A sandstone core sample is cleanly cut and carefully measure in a laboratory after taken out from 30 ft thick formation and 2-acre of oil reservoir in Sabah Water. The cylindrical core has a length of 3 inch and a diameter of 0.75 inch. The core is dried and weight. The dried core weighs 125 g. The core is then saturated with water and weighs of 127.95 g. Neglect the weight of air in the dried core and assume the density of water is 1 g/cc. Determine the porosity of the sandstone core.

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