Q:

How much kb has a mb ,some say 1000 some 1024

HOW MUCH KB HAS A MB ?
GOOGLE SAY 1024 KB IS 1.24 MB
OTHERS SAY 1024 KB IS 1 MB
WHO IS WRONG?
https://www.google.ro/?gws_rd=ssl#q=kb+to+mb
OR 
http://www.tnhost.com/tools/k-kb-mb-gb-tb-conveter

A:

There is a difference between MB and MiB!
See:
1'000 KB = 1 MB (decimal) -> Megabyte (MB)  10^6 Byte = 1 000 000 Byte
1'024 KB = 1 MiB (binary) -> Mebibyte (MiB) 2^20 Byte = 1 048 576 Byte
Thats why you see difference values

