In calculating the Consumer Price Index (CPI) for Year t, which equation is used?
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The consumer price index (CPI) for a given year is the amount of money in that year that has the same purchasing power as $\$ 100$ in 1983 . At the start of 2009 , the CPI was $211 .$ Write a formula for the CPI as a function of $t$ years after $2009,$ assuming that the CPI increases by $2.8 \%$ every year.
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The consumer price index (CPI) of an economy is approximated by the function I(t) = -0.3t^3 + 3t^2 + 100, where t is measured in years, with t = 0 corresponding to the beginning of 2004. Find the inflation rate at the beginning of 2010. 0.1602 0.0251 0.1364 0.0874
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The consumer price index (CPI) of a certain country is given by I(t) = -0.02t^3 + 0.4t^2 + 121 (0 ≤ t ≤ 4), where t = 0 corresponds to the beginning of 2013. Find the annual percentage rate of inflation in the CPI of the country at the beginning of 2016. (Round your answer to three decimal places.)
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