$20$ points, paper submission$)$ Assume SP $=$

$0$xD$00$C before the following instructions are

executed:

ADDRESS INSTRUCTION

$0$x$10$A$4$ BL sub

sub:

$0$x$10$C$0$ mov r$1,$ #$10240$

$0$x$10$C$4$ mov r$2,$ #$0$x$140000$

$0$x$10$C$8$ push $\{$r$1,$ r$2,$ lr$\}$

$0$x$10$CC BX LR

When this program reaches the BX LR

instruction, what is the final value

of the SP$?$