need asm code. help me

i need asm code 4 :

1. product table number

output :

- 10 11 12 ... 20
10 100 110 120 ..
11 110 ....
12 .
13 .
.
.
.
20
-----------------------------------------
2. give number with max 20 digit and print sum of digit

example : 345345345
output :
sum is : 36
------------------------------------------
3. give a string with length=80
delete 20 char from first
delete 20 char from last
and change remind char to uppercase and print it

example
rejhtejkrthekrjtherkjtherkjthrkejt...

output :
JTHER....
--------------------------------------------
4. give this data and calculate tax

paid hour tax
-----------|------|-------
100-150 | 0 | 10%
150-180 | 20 | 11%
180-200 | 50 | 12%
200-250 | 80 | 13%
--------------------------------------

thx from all.
excuse me 4 bad english