LA Theatres, Inc. has two distinct revenue sources, ticket and concession revenues. The following information from LA Theatres, Inc. income statements for the past three years is available:

(a) Calculate gross profit margins for tickets and concessions for all three years. Calculate an overall gross profit margin for LA Theaters, Inc. for all three years.
(b) Analyze the changes in gross profit margin for all three years.

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(in millions) 2010 2009 2008 Ticket revenue Concessions revenue Total revenue Cost of goods sold-tickets $1,731 $1,642 $1,120 411 $2,523 $2,329 $1,531 $951 $ 854 $ 549 48 $1,021 $ 923 597 $1,502 $1,406 $ 934 792 687 Cost of goods sold-concessions 70 69 Total cost of goods soled Gross profit