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Margie and her sister wanted to purchase a bag of popcorn for movie night. They compared the prices and sizes of four bags of popcorn.


Pop-A-Lot Pop Kornz Pop-arazzi Kernels Popcorn
Size 9 ounces 5 ounces 15 ounces 7 ounces
Cost $4.32 $3.00 $8.25 $3.22


Part A: Calculate the corresponding unit rate for each package. (2 points)

Part B: Interpret what the unit rates found in Part A represent. (1 point)

Part C: Choose which package is the best buy. (1 point)

please answer pls


Sagot :

Part A

Recall that unit rates is the amount of change in the dependent variable (y) over 1 increment of the independent variable (x). This is usually a ratio or a fraction.

In this case, the cost and the number of ounces are the dependent and independent variables respectively.

So, the unit rates, starting from the leftmost side of the array, are,

   [tex]\dfrac{4.32 \:dollars}{9 \: oz} =0.48 \frac{dollar}{oz}[/tex]      [tex]\dfrac{3 \: dollars}{5 \: oz}=0.6\frac{dollar}{oz}[/tex]            

[tex]\dfrac{8.25\: dollars}{15\: oz} =0.55\frac{dollars}{oz}[/tex]       [tex]\dfrac{3.22\: dollars}{7\:oz}=0.46\frac{dollars}{oz}[/tex]

Part B

Notice the measurements in each unit rate: it's in dollars per ounces. This tells us how much each ounce of popcorn cost.

Part C

The best package is the one with the cheapest rate, which is seen in package D or the one selling 7 ounces of popcorn for $3.22 at a rate of 0.46 dollars per oz (46¢ per oz).

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