Farley bought $5 worth of school supplies plus pencils at $0.40 per pencil. What is the rate of change in this sentence?
Total = 5
Key word: "per"
Since it's "per" pencil, there should normally be more than one pencil being bought, and it's .40 "per" pencil.
The rate of change is the $0.40
KEY WORD:"PER"
SCHOOL SUPPLIES PLUS PENCILS AT $0.40 PER PENCIL