More back of the napkin for ya:

- let's say there are 100,000,000,000 stars in the galaxy
- according to your percent, there are 78,000,000,000 red dwarves
- that means there are 22,000,000,000 other kinds of stars
- 22 billion is a lot of stars
- unique = 1

These numbers are ballpark, back of the napkin. I've seen estimates of 200-400 billion stars, 90% dwarf (red or otherwise). Even if only 1% are sol-type, this would still be a couple of billion stars like our own.
Source(s):
http://www.solstation.com/habitable.htm

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