To find out how many bags of popcorn Damari needs to sell to reach his goal of $85, we can start by calculating how much more money he needs.
He currently has $40 and wants to reach $85, so we need to find out how much additional money he needs:
\[ 85 - 40 = 45 \]
Now, each bag of popcorn sells for $3. To find out how many bags he needs to sell to make that additional $45, we divide the amount he needs by the price of each bag:
\[ \text{Number of bags} = \frac{45}{3} = 15 \]
Therefore, Damari needs to sell 15 bags of popcorn to reach his goal of earning $85.
The correct response is 15.