Answer:
She paid it for 22 dollars.
Explanation:
First, let's subtract 20 from 108 since we know Mai bought this in total.
108 - 20 = 88
Then, let's divide by 4 because we know there are 4 board games in total.
88/4 = 22.
This means that she paid 22 dollars for it. I hope this helps, I hope it's not wrong, but I don't think it is.