a$.$ Calculate the future growth rate for Solarpower's earnings.

b$.$ If the investor's required rate of return for Solarpower's stock is $15$ percent, what would be the price of Solarpower's common stock? percent.$)$ the investor's required rate of return remains at $15$ percent and that all future new projects will earn $21$ percent.$)$

a$.$ What is the future growth rate for Solarpower's earnings?

$\%($Round to two decimal places.$)$