The table below gives the annual sales (in millions) of a product. year 1998 1999 2000 | 2001 2002 2003 2004 2005 | 2006 sales 229 274 309 334 349 354 349 334 309 What was the average rate of change of annual sales a) Between 1999 and 2000 millions of dollars/year b) Between 1999 and 2006 millions of dollars/year

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