Figure shows an indicator diagram. During path $1-2-3$ , 100 cal of heat  is given to the system and $40 cal$ work is done by the system. During path 1-4-3 work done is $10 cal.$

Heat given to the system during path $1-4-3$ is $70 cal$

If the system is brought from $3$ to $1$ along straight line path $3-1$, work done by the system  is $25 \mathrm{cal}$

Along straight line path $3-1$, the heat ejected by the system is $85 \mathrm{cal}$

The internal energy of the system in state $3$ is $140 cal$ above that in state $1$.