I: list down the subsets, proper subsets and improper subset of the following. 1:A= {5,10,15}
2:A= {love, care, respect}
3:B= { alcohol, mask, soap, sanitizer}​

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?