Using CAPM's formula,
Return on equity = Risk-free rate + Beta*(Expected market return - risk-free rate)
With the given information,
Return on equity = 1% + 1.7*(9% - 1%) = 14.60%
Hence SuperSoft stock's expected return on the projected investment is 14.60%. With the DDM formula,
P_{0} = D_{1}/(K_{e} - g)
With the given information and that calculated using CAPM,
$100 = $1/(14.60% - g)
14.60% - g = 1%
g = 14.60% - 1%
g = 13.60%
Thus the implied growth rate for this stock is 13.6%