Hi Mad Gamble,

To answer you question

1/3 O/L 30 Ret 40 = $1.33 Profit $10
1/5 O/L 50 Ret 60 = $1.50 Profit $10

Total O/L 100

One way to make it easier to work out, is work to a takeout figure of say $50 after converting fractional odds to decimal price.

Example
1/3 = $1.33
1/5 = $1.20
Take out $50
50 / 1.33 = 38 O/L Prof +12
50 / 1.20 = 42 O/L Prof +8
Total O/L 80

Doing it this way makes more money on the higher prices.
And less liability on the lower prices.

Cheers.

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Cheers.