Question: I'm not sure how this answer is correct. I used the Formula (CPI2011-CPI2008)/CPI2008. Then divide the number by 4 years to get the average. I

I'm not sure how this answer is correct. I used the Formula (CPI2011-CPI2008)/CPI2008. Then divide the number by 4 years to get the average. I get 2.86%

I'm not sure how this answer is correct. I used the Formula

1) Suppose that the CPI was 105 on Jan 1, 2008 and 117 in Jan 1, 2011. What was the average annual inflation over the intervening period? A) 4.00% B) 3.97% C) 3.87% D) 3.77% E) 3.67% Answer: E

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