Suppose your annual income is I(t) = 48,000 + 2,000t    (0 ≤ t ≤ 3) dollars per year, where t represents the number of years since you began your job, while your annual expenses are E(t) = 36,000 + 1,500t    (0 ≤ t ≤ 3) dollars per year. Find the area (in dollars) between the graphs of I(t) and E(t) for 0 ≤ t ≤ 3.   $__________________

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