You earn a weekly salary of $475 plus a 5.5% commission on sales at a gift shop. how much would you earn in a week if you sold $700 in goods?

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?