A closed cylindrical tank 4 m high is partly filled with oil of density 800 kg/m to a depth of 3 m. The remaining space is filled with air under pressure. A U-tube containing mercury (relative density 13-6) is used to measure the air pressure, with one end open to atmosphere. Find the gauge pressure at the base of the tank when the mercury deflection in the limb of the U-tube is () 100 mm above, and () 100 mm below the level in the other limb.

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