Please help asap 15 points

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?

Why does the shape of the distribution of the weights of russet potatoes tend to be symmetrical?

Round each decimal to the nearest hundredth