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# What was the cost of a certain telephone call?

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Math Expert
Joined: 02 Sep 2009
Posts: 56239
What was the cost of a certain telephone call?  [#permalink]

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08 Feb 2018, 23:20
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5% (low)

Question Stats:

97% (00:34) correct 3% (00:50) wrong based on 97 sessions

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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.

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

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09 Feb 2018, 00:29
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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09 Feb 2018, 23:58
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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10 Feb 2018, 00:19
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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10 Feb 2018, 03:22
(1) is not sufficient.
(2) 0.32+0.16t, where t is the time in minutes. Also insufficient.

(1)&(2): sufficient.
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Re: What was the cost of a certain telephone call?  [#permalink]

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24 Mar 2018, 12:58
(i) alone is insufficient as it is not giving any information about cost per minute or sec.
(ii) alone is insufficient as it is not giving any information about timing of call.
combination of (i) and (ii) is sufficient.
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Re: What was the cost of a certain telephone call?  [#permalink]

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01 Apr 2018, 22:12
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.

To Find : Cost
We know Cost = Time * Rate

Statement 1 :

Time is given , but we get no information about the Rate -Not Sufficient

Statement 2 :

Rate is given , but we get no information about the Time -Not Sufficient

Combining 1 and 2 :

Cost = (First Minute * 0.32) + 7 * 0.16
Cost = 0.32 + 1.12
Cost = 1.44 Rs

Sufficient

Option C
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Re: What was the cost of a certain telephone call?   [#permalink] 01 Apr 2018, 22:12
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