An ideal gas is made to go through a cyclic thermodynamic process in four steps. The amount of heat involved are Q1=600 J, Q2=ā400 J, Q3=ā300 J and Q4=200 J respectively. The corresponding work involved are W1=300 J, W2=ā200 J, W3=ā150 J and W4.
What is value of W4?