Answer:
156 (thousand dollars)
Explanation:
It wouldn't matter if their boss gave everyone a 20k raise, the range is still the same.
For example, we have a simple set:
5, 2, 6, 2, 1. The range would be 6-1 = 5
If we add 10 to each of the numbers,
15, 12, 16, 12, 11. The range would be 16-11 = 5