Image Company Ltd$,$ currently has the following capital structure based on market values and the respective returns required by investors. Assume that the firm$$s marginal tax rate is $30\%,$ what is the firm$$s weighted average cost of capital $($WACC$)?$

Capital Component

Weighting

Return required by investors

Debt

$60\%$

$8\%$

Preference shares

$10\%$

$10\%$

Ordinary shares

$30\%$

$13\%$

Select one:

a$.$

$8\mathrm{.}26\%$

b$.$

$5\mathrm{.}67\%$

c$.$

$6\mathrm{.}61\%$

d$.$

$4\mathrm{.}96\%$