It varies from target to target (sport to sport). In darts, it's 50 points (which is not the highest score a single dart can get a thrower, by the way). In most shooting sports (bullets and arrows), it's 10 points. The ring around the center or bullseye is worth 25 points in darts, and is worth 9 points in those shooting sports.
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A double bullseye is worth 50 points
UK answer
No such thing as a double bullseye.
A bullseye is a straight fifty points
It is the only number on the board that you can finish a game on without hitting a double
50