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What was the cost of a certain telephone call?

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What was the cost of a certain telephone call? [#permalink]

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New post 08 Feb 2018, 22:20
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What was the cost of a certain telephone call?

(1) The call lasted 8 minutes.

(2) The cost of the first minute of the call was $0.32, which was twice the cost of each minute of the call after the first.
[Reveal] Spoiler: OA

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What was the cost of a certain telephone call? [#permalink]

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New post 08 Feb 2018, 23:29
What was the cost of a certain telephone call?

(1) The call lasted 8 minutes.
This statement does not contain any information about the cost of the call Insufficient

(2) The cost of the first minute of the call was $0.32, which was twice the cost of each minute of the call after the first
This statement does not contain any information about the duration of the call Insufficient

On combining the information present in both the statements,
we can clearly compute the cost of the call $(0.32 + 7*0.16)
Therefore, the combination statement is enough (Sufficient - Option C)
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Re: What was the cost of a certain telephone call? [#permalink]

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New post 09 Feb 2018, 22:58
Bunuel wrote:
What was the cost of a certain telephone call?

(1) The call lasted 8 minutes.

(2) The cost of the first minute of the call was $0.32, which was twice the cost of each minute of the call after the first.

i think answer is c as
statement 1 last for 8 min but doesn't know about cost.
statement 2. Now know about cost but don't know about duration of that certain call
combining both for 1st min 0.32+ 7*0.16
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Re: What was the cost of a certain telephone call? [#permalink]

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New post 09 Feb 2018, 23:19
Bunuel wrote:
What was the cost of a certain telephone call?

(1) The call lasted 8 minutes.

(2) The cost of the first minute of the call was $0.32, which was twice the cost of each minute of the call after the first.



Statement 1 - Duration of the call is given but not the cost
Insufficient

Statement 2 - Cost is given but not duration of the call

Combining 1 and 2

We have both cost and duration of the call

must be C
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Re: What was the cost of a certain telephone call? [#permalink]

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New post 10 Feb 2018, 02:22
(1) is not sufficient.
(2) 0.32+0.16t, where t is the time in minutes. Also insufficient.

(1)&(2): sufficient.
Re: What was the cost of a certain telephone call?   [#permalink] 10 Feb 2018, 02:22
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