Ford Motor Company needs to allocate its advertising budget to different regions. The following information is available:

Region	Sales ($)	Advertising Expense ($)
North America	5,000,000	200,000
Europe	3,000,000	150,000
Asia	2,000,000	100,000
South America	1,000,000	50,000

Required:

1. Allocate the total advertising budget of $600,000 to the regions based on their sales.
2. Prepare a comparative analysis of the advertising expenses and sales for each region.
3. Determine the advertising expense as a percentage of sales for each region.
4. Provide recommendations for optimizing the advertising budget allocation.