Use the Dynamic Exhibit to answer the following questions. 1. The activity base used in this problem is a. units b. hours c. yards d. days 2. When the total factory overhead is $49,000 and the activity base is 9,000, the amount of overhead charged to Job 71 is s 3. When the total factory overhead is $50,000 and the activity base is 10,000, the amount of overhead charged to Job 72 is $ 4. When the total factory overhead is $50,000 and the activity base is 11,000, the amount of overhead charged to Job 72 is $