A system consisting of an ideal gas contained in a cylinder with a frictionless piston is taken around the closed path a → b→ c → a as shown in figure 1 where the process c → a is isothermal. During the closed cycle, the system expels 100 J to the environment. If the heat expelled by the system during the isobaric leg b → c of the cycle is 300 J, what is the change in internal energy ∆U during the process a → b?

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