ABC Co. has obtained some interesting information about OPC company, one of their competitors. OPC company has a total expense per unit of $1.50 at the 15,000 unit level of activity and total expense per unit of $1.45 at the 20,000 unit level of activity. What would ABC co. predict about OPC's variable cost per unit?

A)1.30

B)0.77

C)1.50

D)1.45