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This isn't known until you actually save the file. The size will also depend on how you save.
File > Save - always bigger, nothing ever deleted
File > Save as - dead stuff removed
File > Save as with Fast Web View (may be default) - duplicate backgrouds combined, but extra information added for web view
So, save it, then use command+D to get info.
North America
Europe, Middle East and Africa
Asia Pacific