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Bunuel
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Statement (1)
The charge is deducted daily regardless of usage.
So knowing he didn't use it for two days tells us nothing about his balance.
Not sufficient.
Statement (2)
Bob's initial balance was $0.
Service continues as long as balance is at least (-10).
Maximum total decrease allowed:
14-(-10)=24
24/0.5=48
Sufficient.
Ans B
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I think statement 1 here is irrelevant to the discussion. Irrespective of the non-usage the daily quota will be exhausted. It doesn't seem like a dependency on usage at all. Please lmk if I am missing something here.

findingmyself
Total recharge done=$14
Credit available=$10
Per day cost=$0.5

Equation we know: Number of days=\(\frac{Current balance+$14+$10(Credit)}{$0.5}\)+ Days in case when data is not used at all

Here missing information is Current balance and also we don't know if there are days in which he was totally not using the phone

Statement 1: No of days when phone is not used is given: Not sufficient
Statement 2: Opening balance is given: Not sufficient

Together: We will be having two missing informations, hence sufficient
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Where does it say that the daily quota will be deducted irrespective of usage? I took that into consideration when answering the question.
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The problem states that the service is discontinued when a client's debt exceeds $10. It does not mention any other condition under which the service is interrupted, such as a daily suspension before the debt exceeds $10. Therefore, by the standard GMAT principle of using only the information given, we assume that the service remains active until the debt exceeds $10. Introducing any additional discontinuity would be adding information not stated in the problem.

Username1512
Where does it say that the daily quota will be deducted irrespective of usage? I took that into consideration when answering the question.
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