The total number of people is 5 people if each person gets a ticket a popcorn, each price should be multiplied by 5 or the prices could be added then multiplied by 5.
The first f is the price of the french bread, the 2f is the price of the whole grain(twice that of the french) and f+$2.50 is the cost of the cinnamon raisin ($2.50 more than the french)