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"Galaxy mass" includes the dark part.
Your galaxy would (on average) have 4m dark matter and 1m visible matter (more precise: baryonic matter), for a total of 5m. 80% of the 5m are dark.
Your galaxy would (on average) have 4m dark matter and 1m visible matter (more precise: baryonic matter), for a total of 5m. 80% of the 5m are dark.