Please solve the follwing:

What price would you pay today for a stock if you require a rate of return of 13%, the dividend growth rate is 3.6%, and the firm recently paid an annual dividend of $2.50?

What should you pay for a stock if next year's annual dividend is forecast to be $5.25, the constant-growth rate is 2.85%, and you require a 15.5% rate of return?

What should be the price for a common stock paying $3.50 annually in dividends if the growth rate is zero and the discount rate is 8%?