The following information about No$-$Waste Limited is available:

The market interest rate of similar debentures is $18\%($pre$-$tax$).$ Debentures mature in $10$ years$$ time and the coupon rate thereon is $14\%.$

Tax rate is $28\%$

Calculate the After$-$tax cost of debt of No$-$Waste Limited. $[$Round your final answer to two decimal places.$]$

$($a$)10,08\%$

$($b$)14,00\%$

$($c$)12,96\%$

$($d$)12,43\%$