Answer:
I'm not sure but from my thinking I think it is 40%
Explanation:
I think like this ⬇️
.
100% × [ Number of people for each hair color /25(all people) ]
.
brown hair = 100% × (10/25) = 40%
.
Do the same for the other three hair colors.
.
black = 32%
blonde = 20%
red = 8%
Hope it helps you.