Rhino Inc. hired you as a consultant to help them estimate their cost of capital. You have been provided with the following data: $D1=$$$1$;$PO=$$$23\mathrm{.}7$; and $g=4\mathrm{.}7\%($constant$).$ Based on the DCF approach, what is the cost of equity from retained earnings?

$7\mathrm{.}92\%$

$8\mathrm{.}92\%$

$7\mathrm{.}42\%$

$6\mathrm{.}92\%$

$8\mathrm{.}42\%$