Q$9.$ Consider $8$ bit digital system. $A=26$ and $B=79$ are two decimal numbers.

Perform following arithmetic in $2\text{'}$s complement format and give answer for $S$ in $2\text{'}$s complement binary format $.$

$($i$),S=A+B$

$($ii$)S=A-B$

$($iii$)S=B-A$

$($iv$)S=-A-B$