Assertion: bookmaker's margin | /r/CapableOf | provide guaranteed return of 4.1%
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Source sentences:
text: By cross-matching the odds from Player 2 at Bookmaker A (3.930) with those for Player 1 at Bookmaker B, (1.420) the margin is in the bettor's favour providing a guaranteed return of 4.1% (100 - 95.9 = 4.1).