Nagel Equipment has a beta of $0\mathrm{.}76$ and an expected dividend growth rate of $3\mathrm{.}90\%$ per year. The T$-$bill rate is $4\mathrm{.}00\%,$ and the T$-$bond rate is $4\mathrm{.}75\%.$ The annual return on the stock market during the past $4$ years was $10\mathrm{.}25\%.$ Investors expect the average annual future return on the market to be $14\mathrm{.}00\%.$ Using the SML$,$ what is the firm's required rate of return? Do not round your intermediate calculations.

a$.11\mathrm{.}60\%$

b$.8\mathrm{.}93\%$

c$.11\mathrm{.}78\%$

d$.15\mathrm{.}68\%$

e$.10\mathrm{.}64\%$