"Sixth Rail Corp.$\text{'}$s debt$-$to$-$value ratio is $0\mathrm{.}1,$ the cost of debt is $2\%,$ and the cost of equity is $5\%.$ Find the weighted average cost of capital if the tax rate is $40\%"$

$6\mathrm{.}3\%$

$3\mathrm{.}8\%$

$5\mathrm{.}3\%$

$4\mathrm{.}6\%$

$5\mathrm{.}4\%$