At a local hardware store, Ms. Jones learned that 1 would cost her $.50, 12 would cost $1.00, and the price of 144 would be $1.5
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The constant of proportionality is 5
For the first bar day: 1 cell phone sold: 5 (unit rate:5)
second bar day: 2 cell phones sold: 10 (unit rate:5)
third bar Day: 3 cell phones sold: 15 (unit rate: 5)
fourth bar day: 4 cell phones sold: 20 (unit rate 5)
Basically you divide the cell phones sold by the day or
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