A cell phone plan cost $150 to start. Then there's a $30 charge each month. Is there a proportional relationship between the time in the cost of the cell phone plan? Type yes or no?

Yes

Step-by-step explanation:

Since in the question it is mentioned that the cost of the cell phone plan is $150 to start and after that it would be charge $30 for each and every month

So according to the every month, the charges would be applied

Therefore it is directly proportional to the time period

Hence, the answer is yes

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step-by-step explanation:

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