Kuwait Co$.$ has a debt$/$equity ratio of $0\mathrm{.}6,$ and after tax cost of debt of $7\mathrm{.}5\%.$ You also know that the international beta of Kuwait Co$.($based on a world index$)$ is $1\mathrm{.}2,$ the related stock market historical average return is $10\mathrm{.}5\%$ and the related risk free rate is $3\mathrm{.}5\%,$ what would be the proper weighted average cost of capital $($WACC$)$ of Kuwait Co$.?$