An advertising agency conducted a survey and found that the number of units sold, N, is related to the amount a spent on advertising (in dollars) by the following formula:
N = 3,500 + 300 ln a (a ≥ 1)
How many units are sold after spending $1,000
N =3500 +300 * ln 1000 = 3500+300* 6.907755 = 3500+2072 = 5572
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