Angle b has a measure between 0° and 360° and is coterminal with a –865° angle. what is the measure of angle b?

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?