w * ratio
0: 0%
1: 20%
2: 50%
3: 75%
4: 90%
5: 100%
6: 105%
7: 110%
8: 114%
9: 117%
10: 120%
For example, if a pair of students earn w = 100 points with 4:6 ratio,
then then the students will receive 90% and 105% respectively.