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.
|Magma Trout||Magma Largemouth Bass||Magma Swordfish||Total|
|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.