Data Segment
  arr db 33,45,12,03,01
Data Ends

Code Segment
  Assume cs:code, ds:data
  Begin:
    mov ax, data
    mov ds, ax
    mov es, ax
    mov cx, 5
    lea si, arr
    L1:
       mov ah, 00
       mov al, [si]
       cmp al, 30
       jg Greater
    Not_Greater:
       add al, 20
       mov [si], al
       inc si
       loop L1
    Greater:
       add al, 10
       mov [si], al
       inc si
       loop L1
    Exit:
       mov ax, 4c00h
       int 21h
Code Ends
End Begin