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

step-by-step explanation:

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