An advertising agency conducted a survey and found that the number of units sold, (N), is related

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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:

\[N=1,500+300 \ln a(a \geq 1)\]

How much needs to be spent (to the nearest hundred dollars) to sell 4,000 units? \$4,200

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