I was fishing for magma fish at Eruption Island. I didn't upgrade my rarity chance. I noted down every time I got a fish in a tally. These are my results.
Location of experiment. Eruption island volcanno, entrence area
Results
Magma Trout
Magma Largemouth Bass
Magma Swordfish
Total
Caught
28
12
2
42
Probability (fraction)
2/3
2/7
1/21
1/1
Probability (per cent, rounded to the nearest whole)
67%
29%
5%
100%
Using these results I calculated the average amount of money per fish: (2/3)*16+(2/7)*99.2+(1/21)*427.2 ≈ 10.7+28.3+20.3 = 50.3.