For $300\mathrm{.}0mL$ of a buffer solution that is $0\mathrm{.}205M$ in $HCH{O}_2$ and $0\mathrm{.}280M$ in $KCH{O}_2,$ calculate the initial $pH$ and the final $pH$ after adding $0\mathrm{.}025$mol of $.)$

Express your answers to two decimal places. Enter your answers numerically separated by a comma.