The table below lists the U.S. median annual family income every 5 years during the period 1975-2015. It also contains several values for each of two simple indexes for median family income.
a. Calculate the missing values of each simple index.
b. Interpret the index for 1990.

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Income ($) Base 1975 Index Year Base 1980 Index 1975 13,719 21,023 27,735 35,353 40,611 50,732 56,194 60,363 53,657 65.26 1980 1985 1990 1995 2000 2005 2010 2015 153.24 202.16 257.69