Mathmatically It makes alot of sense and ease to round off numbers to their next full number, tens, hundreds etc etc. The exact measure is that there are 1024MB in one gigabyte but for sheer convinced the 24MBs are rounded off to plain 1000MB =1GM.
I would advise though that to avoid confusion you just stick to the more known/accepted 1000MB=1GB wrong as it might be
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