# Less than 10
1 - 5:  5
6 - 9: 10

# 10 to 100
10 - 14: 15
15 - 19: 20
20 - 24: 25
etc.

# 100 to 1000
100 - 124: 125
125 - 149: 150
150 - 174: 175
etc.

# 1000 and beyond
1000 - 1249: 1250
1250 - 1549: 1500
1500 - 1749: 1750
etc.