File too big?

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From: Mansoor Azam (mansoorb_at_shoa.net)
Date: 05/15/04 

Date: Sat, 15 May 2004 15:07:57 +0500

I have an excel file with logins in column A and passwords in column B. Each
login is 12 characters and each password is 8 characters. There are 20
thousand logins and passwords ( i.e. 20 thousands rows or 20K rows)

Now since 1 character = 1 byte and 1 row consists of 20 characters ( 12+8)
the data should be about 20K * 20 = 400 K
Even if there is an overhead of say 5 characters in every row the data would
be about 20K * 25 = 500K

So my file should be around 400 to 500 K in size

but its 1,517 KB

why?

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