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 $ 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 $