Credit Cards in China In a 2010 report, U.S. retail e-commerce sales (excluding travel, digital downloads, and event tickets) from 2011 through 2014 are projected to be f(t) = 157.6e0.09t (1 t 4) billion dollars in year t, where (t = 1) corresponds to 2011. What is the average number of e-commerce sales in the United States over the period under consideration? 

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