$$Maria$$ Gonzalez, Ganado's Chief Financial$$ Officer, estimates the$$ risk$-$free rate to be $3\mathrm{.}10\%,$ the$$ company's credit risk premium is $3\mathrm{.}60\%,$ the domestic beta is estimated at $0\mathrm{.}99,$ the international beta is estimated at $0\mathrm{.}82,$ and the$$ company's capital structure is now $50\%$ debt. The$$ before$-$tax cost of debt estimated by observing the current yield on$$ Ganado's outstanding bonds combined with bank debt is $7\mathrm{.}70\%$ and the$$ company's effective tax rate is $38\%.$ Calculate both the CAPM and ICAPM weighted average costs of capital for the following equity risk premium estimates.

a$.8\mathrm{.}50\%$

b$.7\mathrm{.}50\%$

c$.5\mathrm{.}50\%$

d$.4\mathrm{.}40\%$