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Bookmaking gambling percentages pre-decimal

Percebtages
The following is a table for working out the total market percentages using pre-decimal prices.
Price
%
Price
%
Evens
50
11/2
15.4
11/10
47.6
6/1
14.3
5/4
44.4
13/2
13.3
11/8
42.1
7/1
12.5
6/4
40
8/1
11.1
13/8
38.1
9/1
10
7/4
36.4
10/1
9.1
2/1
33.3
12/1
7.4
9/4
30.8
14/1
6.5
5/2
28.6
16/1
5.7
11/4
26.7
20/1
4.8
3/1
.25
25/1
3.8
7/2
22.2
33/1
3.0
4/1
20
50/1
2.0
9/2
18.2
66/1
1.5
5/1
16.7
100/1
1.0