Suppose annual expenditures on health in a certain country from 1980 to 2010 could be modeled by F(t) = 284(1.08)t billion dollars    (0 ≤ t ≤ 30) (t = 0 represents 1980). What was the average annual expenditure over the period shown? (Round your answer to the nearest billion dollars.) HINT [See Example 2.] $ billion

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