Plot $($by hand$)$ the response in the overall effluent concentration to a step up in the influent concentration at t$=0$ from $0$g$/$m$3$ to $100$g$/$m$3,$ from a system involving a PFR followed by $($in series$)$ an equally sized CSTR$.$ Assume a conservative chemical. Assume the residence time of each individual reactor $($PFR & CSTR$)$ is $2$ hours and include appropriate labels$/$scales on your plot $($drawn to scale$).$