Nikki by seven packs of silly bands from the store. After school the next day she decides to buy three more packs to give to her friend Olivia. Then she realizes that if she didn't buy something for Gary to carry would be mad. So Nikki went back to the store again about two more packs of silly bands to give to Carrie. If Nikki spent a total of $14.40 how much which was each bag of silly bands