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# A certain telephone company offers two plans, A and B. Under

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Joined: 05 Dec 2005
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Location: Manhattan Beach, CA
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A certain telephone company offers two plans, A and B. Under [#permalink]  30 Apr 2006, 20:32
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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 and$0.06 per minute thereafter. Under plan B, the company charges $0.08 per minute for each call. What is the duration, in minutes, for which the company charges the same under plan A and plan B? 2 9 15 21 30 I canâ€™t figure out how to set this one up. Please provide the algebra. Hint: The answer is 9. VP Joined: 06 Jun 2004 Posts: 1059 Location: CA Followers: 2 Kudos [?]: 47 [0], given: 0 [#permalink] 30 Apr 2006, 23:04 In order to find out the minutes where two plans would charge the same, we have to set the equation equal to each other. x being the minutes charged 0.6+0.06(x-7) = 0.08x _________________ Don't be afraid to take a flying leap of faith.. If you risk nothing, than you gain nothing... Senior Manager Joined: 08 Jun 2004 Posts: 499 Location: Europe Followers: 1 Kudos [?]: 20 [0], given: 0 [#permalink] 01 May 2006, 02:07 The answer is '9'. Plan A: first 7 min$0.60
Plan B: first 7 min $0.56 A: 0.60+0.12 (2min*$0.06) = $0.72 B: 0.56+0.16 (2min*$0.08) = \$0.72
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