What is the total work done in a cyclic process?

$A$ gas is taken through the cycle $A \to B \to C \to A$ as shown in the figure. What is the net work done by the gas in $J$?

Which of the following graphs correctly represents the thermodynamic processes shown?

Four moles of an ideal monoatomic gas undergoes a cyclic process $ABCA$ as shown in the figure. Find the ratio of the temperature of $A$ and $B$.

In a thermodynamic process,the pressures and volumes corresponding to some points in the figure are $P_A = 3 \times 10^4 \, Pa$,$V_A = 2 \times 10^{-3} \, m^3$,$P_B = 8 \times 10^4 \, Pa$,and $V_D = 5 \times 10^{-3} \, m^3$. In process $AB$,$600 \, J$ of heat is added,and in process $BC$,$200 \, J$ of heat is added to the system. The change in the internal energy in process $AC$ would be .... $J$.

Calculate the heat given to the gas during the cyclic process $ABA$ shown in the figure (in $J$).