Sam created candy loot bags for halloween. he put 3 gummy bears, 2 lollipops, 5 mars bars and 7 sour keys in each bag. sam was not sure how many loot bags to create but remembered that last year, 2 kids arrived during the first hour and that the number of kids doubled every hour for the next 3 hours. how many pieces of candy did sam need in total? (based on last year’s trick or treater’s)