Andre has some water hose for his drip sprinkler system. he cut the hose into 5 equal pieces. each piece was 12 ft long. how long was the original piece of hose?

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?