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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The derivative of I(t) is I'(t) = -0.06t^2 + 0.8t. Show more…
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