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?

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