4.5%hold — the two sides cost 104.76¢ together, 4.76¢ more than a dollar
Side 1 -11050¢was 52.38¢ · fair +100
Side 2 -11050¢was 52.38¢ · fair +100
Stripped by proportion: each price keeps its share of the total, which is the method you can check by hand. Others exist and disagree on lopsided markets, where the favourite arguably carries more of the hold than proportion implies.