$4.$ Rivoli Inc. hired you as a consultant to help estimate its cost of capital. You have been provided with the following data: D$0=$ $$0\mathrm{.}80$; P$0=$ $$25\mathrm{.}00$; and g $=8\mathrm{.}00\%($constant$).$ Based on the DCF approach, what is the cost of equity from retained earnings? Do not round your intermediate calculations. a$.9\mathrm{.}85\%$ b$.14\mathrm{.}32\%$ c$.11\mathrm{.}46\%$ d$.9\mathrm{.}74\%$ e$.13\mathrm{.}17\%$