changing the number of shares of common stock outstanding. a. Calculate the future growth rate for Solarpower's earnings. b. If the investor's required rate of return for Solarpower's stock is 14 percent, what would be the price of Solarpower's common stock? (Assume that the investor's required rate of return remains at 14 percent.) model work in this case? Why or why not? (Assume that the investor's required rate of return remains at 14 percent and that all future new projects will earn 21 percent.)