These 2 questions were so difficult for me, Please help?

Lufthansa, Inc. uses two different carriers (Airbus and Boeing) and allocated costs with two different activities: Machining, which uses machine hours as an activity driver, and Inspection, which uses number of round trips as an activity driver. The activity rate for Machining is $140 per machine hour, and the activity rate for Inspection is $510 per batch. The activity drivers are used as follows: Machine hours Number of round trips Airbus 1,800 46 Boeing 3,100 19 Total 4,900 65 What is the amount of Inspection cost assigned to Airbus? Multiple Choice $33,150 $23,460 $252,000 0 $9,690 $9,690 Twitter for Education is an LLC. Their internal quarterly reports show the following ending balances: Direct materials used Direct labor Salaries for accountants Indirect labor HR manager's salary Marketing costs Factory rent $ 14,500 $23,750 $13,600 $ 2,900 $ 5,000 $ 9,230 $ 4,875 What the company's prime costs