The sales S (in billions of dollars) for Walgreens from 2000 through 2010 can be modeled by the exponential function S(t) = 22.52(1.125)^t where t is the time in years, with t = 0 corresponding to 2000. (Round your answers to two decimal places.) (a) Use the model to estimate the sales in 2017. $ 92.55 billion (b) Use the model to estimate the sales in 2019. $ 117.14 billion
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