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 $73,000 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: a. 7,300 b. 10,500 Oc 11,500 d. 11,000 e. None of the answers given