$-$If DS$=7$FA$2$H and the offset is $438EH$

a$)$ Calculate the physical address

$7FA20+438E=83$DAE

b$)$ calculate the lower range

$7$FA$2$:$438$E show the addition steps for $($c$),$upper range $,$ on how the digits are added to get the result without converting in binary $.$ show the addition in hexadecimal number sytem $.$ No need to show the addition for $($a$),($b$)$ and $($d$)$