Estelle is having her birthday party at Gold Frames Art Museum this year. A party package costs $265 and covers the entrance fee for guests, a private party room, and an activity guide. Estelle upgraded her package to include a favor for each of her 8 guests, bringing the total to $305. Which equation can you use to find f, the cost of each favor? How much did each favor cost?

The original package without the favor included costs $265. The upgraded package with the favor included costs $305. Therefore, the cost of the favor for each guest is the difference between these two amounts, which is $305 - $265 = $<<305-265=40>>40.

The equation that can be used to find f, the cost of each favor, is f * 8 = 40.

Therefore, each favor cost $40.