Conan Company's monthly activity level ranged from a low of 17,000 units in May to a high of 26,000 units in October. Average production was 20,000 units per month. Utilities cost was $8,250 in May and $10,500 in October. The variable utility cost per unit, to the nearest cent, is:
A. $0.25
B. $0.40
C. $0.47
D. $0.49