$1-$ IfRf $=7\%,$ Rm $=12\%,$ and B $=1\mathrm{.}2,$ what is the required rate of return on the firm's stock?

$2-$ What is the value of a stock that is expected to pay a constant dividend of $$2$ per year if the required return is $15\%?$

$3-$ What is the value of a stock if company starts increasing dividends by $3\%$ per year beginning with the next dividend? The required return remains at $15\%.$