BMW has the following cost data for its car models: 3 Series, 5 Series, and 7 Series:

Model	Direct Materials	Direct Labor	Overhead Rate (% of Direct Labor)
3 Series	$40,000,000	$20,000,000	130%
5 Series	$45,000,000	$22,000,000	130%
7 Series	$50,000,000	$25,000,000	130%

Requirements:

1. Calculate the total manufacturing cost for each car model.
2. Determine the overhead costs applied to each model.
3. Prepare a job cost sheet for each model.
4. Compute the profit margin if the selling prices are $50,000, $60,000, and $70,000 for 3 Series, 5 Series, and 7 Series, respectively.
5. Analyze the cost allocation and suggest potential improvements.