Imagine some colored blocks are laid out in a row: three red, two blue, three red, two blue and so on. If there are 65 colored blocks, how many would be red? A. 52
B. 39
C. 26
D. 13

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?