Help me guys this is 7th grade math

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?

How can you find the mean absolute deviation (mad) for this set of data?

Identify this conic section. x2 - y2 = 16 o line circle ellipse parabola hyperbola