The unemployment rate in a certain country was dropping at a constant rate of 0.2% (= 0.002, in decimals) between 2009 and 2019. In 2012, the unemployment rate was 3.5%. Let t be the number of years since 2009 and let U(t) be the unemployment rate at year t. (a) Find a formula for the function U. (Hint: use decimals in place of percentages.) U(t) = (b) Assuming the model is valid for a couple of more years after 2019, calculate the expected unemployment rate in year 2021. Enter your answer as a percentage.

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