What is the internal energy of an unknown gas at point B in a P-V diagram?

A gas undergoes a process A-B that traces a straight line in the P-V diagram. At A the gas has a pressure of 75 kpa and a volume of 12L.
At B the pressure is 60kPa and the volume is 20L. The heat gained in this process is 600J. What is the internal energy of the gas at B?

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