Gases and Thermodynamics Question?

A fish swim bladder has a volume


A fish swim bladder with a volume of 5.0 * 10^-4 m^3. The fish descends from 3.0 atm to deeper water where the bladder is compressed to 60% its initial volume. As the fish descends, the gas pressure in the swim bladder is always equal to the water pressure, and the temperature of the gas remains at the internal temperature of the fish's body. the fish must add gas to 

re-inflate its swim bladder to the original volume. What's work required to expand the swim bladder back to its original volume

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