Answer to these questions please.

1. Why aren't actual manufacturing overhead costs traced to jobs just as direct materials and direct labor costs are traced to jobs? 2. What is the predetermined overhead rate, and how is it computed? 3. What factors should be considered in selecting a base to be used in computing the predetermined overhead rate? 4. If a company fully allocates all of its overhead costs to jobs, does this guarantee that a profit will be earned for the period? Why or why not? 5. What adjustment to cost of sold is made for underapplied overhead? What adjustment is made for overapplied overhead? 6. What is a plantwide overhead rate? Why are multiple overhead rates, rather than a plant-wide overhead rate, used in some companies? 7. What happens to overhead rates based on direct labor when automated equipment replaces direct labor