XYZ Company uses the high low method to analyze the mixed cost. According to the cost formula derived, the total fixed cost is $10,000. Total cost at the high level of activity was $82,000 and at the low level of activity was $25,000. If the low level of activity was 2,500 units, what was the high level of activity in units? Select one: O a. None of the answers given O b. 8,200 O c. 11,500 O d. 12,000 O e. 11,000