O$6(6$ pts$.)$: Three generating units operating in parallel at $60$ Hz $.$ G$1$ has a rating of $400$ MW and an $\backslash ($ R $\backslash )$ of $\backslash (4\backslash \%\backslash )$ based on its own rating. G$2$ has a rating of $600$ MW and an R of $\backslash (3\backslash \%\backslash )$ based on its own rating. G$3$ has a rating of $800$ MW and an R of $\backslash (2\mathrm{.}67\backslash \%\backslash )$ based on its own rating. These units were delivering $400,500,$ and $600$ MW respectively, at $60$ Hz $.$ Due to a change in load, an increase in the system frequency of $0\mathrm{.}2$ Hz is experienced. Determine $($by calculations and by using the graphs below$)$ the amount of the change in generation of each unit to absorb the load change.