Step 1 of 6 Simplify within the inner parentheses.
-8-{-1-4[(3 – 6)2 – 25]}
2
= -8
- 25

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?