Response to the following problem:
Saratoga Company has assembled the following data about its variable costs:
Level of Activity........................ Total Variable Cost
2,000 units..............................$ 46,000
3,000 units.................................72,000
4,000 units.................................96,000
5,000 units............................... 120,000
6,000 units............................... 150,000
The company is currently producing 3,300 units. According to these data, what is the relevant range over which the company can assume that the variable cost per unit is constant?