An ideal gas is taken through a cyclic thermodynamic process through four steps. The amounts of heat involved in these steps are Q1=5960 J, Q2=-5585 J, Q3=-2980 J and Q4 respectively. The corresponding works involved are W1=2200 J, W2=-825 J, W3=-1100 J and W4=765 J respectively. The efficiency of the cycle is
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