Plz HELPPP WITH DIS LOOK AT THE PHOTO

The final cost of a sale is determined by multiplying the price on the tag by 75%. which best describes the function that represents the situation?

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?

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m