To determine how many bags Damari needs to sell, we need to calculate the difference between his goal and his current amount of money.
Goal amount = $85
Current amount = $40
Difference = Goal amount - Current amount = $85 - $40 = $45
Since each bag of popcorn costs $3, we can calculate the number of bags Damari needs to sell by dividing the difference by the cost per bag:
Number of bags = Difference / Cost per bag = $45 / $3 = 15 bags
Therefore, Damari needs to sell 15 bags of popcorn to reach his goal.