Ok, I just need this quick question: I will give about 50 points for an answer and if there is two answers, I will mark the first one as brainliest.

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?

Is of - 4x + 2? a. 3 b. 4 c. 6 d. 5

Mariano delivers newspaper. he always puts 3/4 of his weekly earnings in his savings account and then divides the rest equally into 3 piggy banks for spending at the snack shop, the arcade and the subway