Question: The average annual increase i (in %) of the cost of living over n years is given by i = 100[(C 2 /C 1 )

The average annual increase i (in %) of the cost of living over n years is given by i = 100[(C2/C1)1/n − 1],  where C1 is the cost of living index for the first year and C2 is the cost of living index for the last year of the period. Evaluate i if C1 = 237 and C2 = 258  are the values for 2015 and 2020, respectively.

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