Aging Population: The population of Americans age 55 and older as a percentage of the total population is approximated by the function f(t) = 10.72(0.9t + 10)0.3      (0 ≤ t ≤ 20) where t is measured in years, with t = 0 corresponding to the year 2000.† At what rate was the percentage of Americans age 55 and older changing at the beginning of 2007? ______ % per year At what rate was the percentage of Americans age 55 and older changing in 2018? _______% per year What was the percentage of the population of Americans age 55 and older in 2018?  ______% per year

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