From the data in Table 14-1 in the text, calculate the overall rate change of first-class postage

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From the data in Table 14-1 in the text, calculate the overall rate change of first-class postage as measured by the LCI for the following decades:

(a) The 1970s (1970-1979)

(b) The 1980s (1980-1989)

(c) The 1990s (1990-1999)

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