The table shows the value of susie's bank account during a 5-year period. at what rate has her account value been growing? a) $16,000 per year b) $8,000 per year c) $4,000 per year d) $1,000 per year year value 2004 $8000 2005 $12,000 2006 $16,000 2007 $20,000 2008 $24,000