Amelia is considering a plan for summer. She could take courses, or she could work at a local grocery store. Which of the following is an opportunity cost of taking courses? Multiple Choice Cash paid for her courses. O The time spent studying. O O The wages she could have earned working at the grocery store. O Her textbook costs. Arthur Andersen LLP's strategic consulting team had been hired to advise Enron Inc. on their costing system. They correctly advise them that the activity-rate method involves: Multiple Choice dividing the total activity driver by the total activity cost. O calculating the proportion of each activity driver used by each product. O calculating an activity rate that is similar to the predetermined overhead rate. O O multiplying the total activity cost by the total activity driver. Pepsico was trying to use the weighted average costing method. How could they use the weighted average method of process costing and calculate how many cans were worked on during a period? Multiple Choice Add beginning units in inventory and units completed Add beginning units in inventory and ending units in inventory Add units completed and ending units in inventory Add units started and units completed