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GRE Prep Club Team Member
Joined: 20 Feb 2017
Posts: 2506
Given Kudos: 1055
GPA: 3.39
A certain telephone company offers two plans, A and B. Under plan A, t
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28 Dec 2022, 09:52
28 Dec 2022, 09:52
Expert Reply
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Question Stats:
100% (01:57) correct
0% (00:00) wrong based on 4 sessions
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A certain telephone company offers two plans, A and B. Under plan A, the company charges a total of $0.60 for the first 7 minutes of each call and $0.06 per minute thereafter. Under plan B, the company charges $0.08 per minute of each call. What is the duration of a call, in minutes, for which the company charges the same amount under plan A and under plan B?
A. 2
B. 9
C. 15
D. 21
E. 30
A. 2
B. 9
C. 15
D. 21
E. 30
GRE Prep Club Team Member
Joined: 20 Feb 2017
Posts: 2506
Given Kudos: 1055
GPA: 3.39
Re: A certain telephone company offers two plans, A and B. Under plan A, t
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30 Dec 2022, 23:14
30 Dec 2022, 23:14
Expert Reply
Let the duration, in minutes, for which the company charges the same under plan A and plan B be t minutes.
Then under plan A the cost would be $0.6+0.06(t-7) and under plan B the cost would be $0.08t. We want these amount to be equal: 0.6+0.06(t-7)=0.08t --> 60+6(t-7)=8t --> t=9.
Answer: B.
Then under plan A the cost would be $0.6+0.06(t-7) and under plan B the cost would be $0.08t. We want these amount to be equal: 0.6+0.06(t-7)=0.08t --> 60+6(t-7)=8t --> t=9.
Answer: B.
gmatclubot
Re: A certain telephone company offers two plans, A and B. Under plan A, t [#permalink]
30 Dec 2022, 23:14
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