Use the data in Table 1.11 to determine the 1991 cost in 2008 dollars of mailing a first-class letter. Is this value higher or lower than the actual $0.42 cost of mailing a letter in 2008?

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Date Introduced First-Class Postage Rates ($) CPI (2008-100) 7/1/1885 11/3/1917 0.02 4.3 0.03 6.0 7/1/1919 0.02 8.2 7/6/1932 0.03 6.4 8/1/1958 0.04 13.6 1/7/1963 0.05 14.4 1/7/1968 0.06 16.4 5/16/1971 0.08 19.0 3/2/1974 0.10 23.2 12/31/1975 0.13 25.3 5/29/1978 0.15 30.7 3/22/1981 0.18 42.8 11/1/1981 0.20 42.8 2/17/1985 0.22 50.7 4/3/1988 0.25 55.7 2/3/1991 0.29 64.3 1/1/1995 0.32 71.7 1/10/1999 0.33 78.4 1/7/2001 0.34 83.3 6/30/2002 0.37 84.7 1/8/2006 0.39 94.9 5/14/2007 0.41 97.1 5/12/2008 0.42 100.0