Let's say you are playing a lucky draw game: you can invest $100 in every animal multiple times (e.g. you can invest $200 in a dog), you can invest any number of animals you want (e.g. you can invest in both a panda and a rabbit together, if a panda is drawn, you will win $500 and lose $200: the amount that you invested). Let the amount you invested be n, there are in total 8 animals to be drawn:
1. Dog: benefit = n*5, 19.4%
2. Panda: benefit = n*5, 19.4%
3. Monkey: benefit = n*5, 19.4%
4. Rabbit: benefit = n*5, 19.4%
5. Penguin: benefit = n*10, 9.5%
6. Turtle: benefit = n*15, 7%
7. Seal: benefit = n*25, 3.8%
8. Whale: benefit = n*45, 2.1%
Conclude the best set to maximize profit, which means the highest return set.