Q$-4)$ Convert the following numbers as directed:

One mark for procedure and one mark for correct answer.

$($a$)(A19\mathrm{.}8{)}_{16}=(,)10$

$($b$)$ Convert $(8976)10$ into its equivalent BCD Code.

$($c$)$ Compute $(18)10-(86)10$ using $9\text{'}$s Complement Method.

$($d$){)}_2$

$($e$)$ Compute $($F$8$E$6)\}\{9\}$ without changing its base.