a. If the required rate of return of investors increased to 12% and $15 annual dividend. What is the price of the preferred stock? b. If the required rate of return of investors increased to 8% and $10 annual dividend. What is the price of the preferred stock? c. Assuming the annual preferred dividend (Dp) is $10, and the price of the preferred stock (Pp) is $100, what is the required rate of return (yield)? d. If the annual preferred