A thermodynamic process is shown in figure. The pressures and volumes corresponding to some points in the figure are:PA=3×104PaPB=8×104Pa and VA=2×10−3m3VD=5×10−3mIn process AB, 600 J of heat is added to the system and in process BC, 200 J of heat is added to the system. The change in internal energy of the system in process AC would be