1). 12 x 3²=
2). 11 × 2 + 3 =​

Hello, my name is Rafli, I come from Indonesia, I am 13 years old​

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?