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The general fund budget (in billions of dollars) for a U.S. state for 1988 (period 1) to 2011 (period 24) follows. Year Period Budget ($ billions) 1988 1 3.03 1989 2 3.29 1990 3 3.56 1991 4 4.41 1992 5 4.36 1993 6 4.51 1994 7 4.75 1995 8 5.15 1996 9 5.34 1997. 10 5.66 1998 11 6.11 1999 12 6.20 2000 13 6.48 2001 14 6.75 2002 15 6.56 2003 16 6.88 2004 17 6.98 2005 18 7.65 2006 19 8.38 2007 2008 2009 2010 2011 20 21 22 23 24 8.57 8.76 8.53 8.33 8.86 (b) Develop a linear trend equation for this time series to forecast the budget (in billions of dollars). (Round your numerical values to three decimal places.) (c) What is the forecast (in billions of dollars) for period 25? (Round your answer to two decimal places.) $ billion