Question 13 refers to the following data.

2002 AIRPLANE INVENTORY FOR AIRLINES A AND B BY YEAR OF PURCHASE (as a percent of the 2002 inventory)

New regulations go into effect in 2003 that require all planes in inventory to be newer than ten years old. Each year following 2002, both airlines need to sell the planes the regulations force them to eliminate from inventory, and then use the proceeds of those sales to increase their inventory by 10% (rounded down because they are unable to buy fractions of planes). What is the combined number of planes owned by the two companies following their sales and purchases in 2004 ?

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Airline A Airline B Total 2002 inventory: 250 Total 2002 inventory: 450 20% 8% 10% 10% 14% 12% 10% 6% 6% 2002 4% 2001 2000 4% 1999 6% 1998 1997 1996 1995 4% 1994 6% 1993 8% 12% 10% 16% 14% 20%