To determine how many bags of popcorn Damari needs to sell to reach his goal of $85, we can first calculate how much more money he needs to make:
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Damari currently has $40.
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His goal is to have $85, so the amount he still needs to earn is:
\[ 85 - 40 = 45 \]
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Since each bag of popcorn sells for $3, we can find out how many bags he needs to sell by dividing the amount he still needs by the price per bag:
\[ \frac{45}{3} = 15 \]
Therefore, Damari needs to sell 15 bags of popcorn to reach his goal of $85.
So the correct answer is:
15