From The Data In Table 14 1 In The Text

From the data in Table 14-1 in the text calculate the average annual inflation rate of first class postage as measured by the LCI for the following years:

(a) End of 1970 to end of 1979

(b) End of 1980 to end of 1989

(c) End of 1990 to end of 1999

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