The U.S. national debt stood at $10.025 trillion in 2008 (t = 0) and was growing at the rate of R(t) = 0.070251+2 -0.51548t+2.1667 (0≤t≤4) trillion dollars/year in year t between 2008 and 2012. What was the U.S. national debt in 2012? (Round your answer to three decimal places.)

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