Calculate the required rate of return for Moon, Inc.$\text{'}$s stock. Moon's beta is $0\mathrm{.}6,$ the risk$-$free return is percent, and the expected return on the market is $7\mathrm{.}5$ percent. $6\mathrm{.}5\%8\mathrm{.}4\%10\mathrm{.}1\%16\mathrm{.}4\%18\mathrm{.}0\%$