GATE Mechanical Engineering (ME) 2020 Shift 2 Solved Paper

One $\mathit{k}\mathit{g}$ of air in a closed system undergoes an irreversible process from an initial state of ${\mathit{p}}_1=1$ bar (absolute) and ${\mathit{T}}_1={27}^{\circ }\mathit{C}$, to a final state of ${\mathit{p}}_2=3$ bar (absolute) and ${\mathit{T}}_2=$ ${127}^{\circ }\mathit{C}$. If the gas constant of air is $287\mathit{J}/\mathit{k}\mathit{g}\cdot \mathit{K}$ and the ratio of the specific heats $\mathit{\gamma }=1.4$, then the change in the specific entropy (in $\mathit{J}/\mathit{k}\mathit{g}\cdot \mathit{K})$ of the air in the process is