Posted by **Larry** on Thursday, May 9, 2013 at 10:38am.

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 = 6,500 + 400 ln a (a ≥ 1)

How many units are sold after spending $1,000? (Round your answer to the nearest whole number.)

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