Answer:
50%
Step-by-step explanation:
The answer is c, or 12. 3 times 7 is 21, minus nine is 12
The number of pencils and total cost are in a proportional relationship because the cost increases with the number of pencils.
Option D is correct.
Step-by-step explanation:
The cost of One Pencil = $3
The cost of 3 Pencils = $9
So, as the number of pencils are increasing, the total cost of pencils is also increasing because cost of 1 pencil is $3 and cost of 3 pencils increases to $9
So, we can say that the number of pencils and total cost are in a proportional relationship because the cost increases with the number of pencils.
Option D is correct.
Keywords: Proportional relationship
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