here is my problem and i'm not sure which functions will get me the answer
that i need!

# of persons: 20

Each person can have 1 item from each Category:

Category 1 Atk Def
Item 1 30 30
Item 2 39 14

Category 2 Atk Def
Item 1 15 43
Item 2 8 56

Category 3 Atk Def
Item 1 25 42
Item 2 55 26

So I need to know a way to calculate the best possible combination, it could
be different amounts of both Item 1 and Item 2 in each category or all of
Item 1 in one category, all Item 2 in another category etc.

How would I calculate this please?