Phone Charge

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umaa: Legendary Member; Posts: 727; Joined: Sun Jun 08, 2008 9:32 pm; Thanked: 8 times; Followed by:1 members

Phone Charge

by umaa » Tue Jul 28, 2009 5:43 pm

A phone company charges 3/4 of its regular per-minute rate for
long-distance calls for each minute in excess of 1000 per
month, excluding calls made on Sundays, and 1/2 of its regular per-minute rate for all long-distance calls made on Sundays. How much did the phone company charge Victoria last month?

(A) Last month, Victoria made a total of 1500 minutes worth of long-distance calls, including 200 minutes worth on Sundays.

(B) The regular rate for long-distance calls is $0.10 per minute.

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Source: Beat The GMAT — Data Sufficiency | Tue Jul 28, 2009 5:43 pm

pandeyvineet24: Legendary Member; Posts: 527; Joined: Mon Jun 02, 2008 9:14 am; Location: Atlanta; Thanked: 17 times

by pandeyvineet24 » Tue Jul 28, 2009 5:57 pm

Should be C.

Total cost = 1000 * 0.10 + (300 * 0.75 * 0.10) + (200 * 0.5 * 0.10)

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umaa: Legendary Member; Posts: 727; Joined: Sun Jun 08, 2008 9:32 pm; Thanked: 8 times; Followed by:1 members

by umaa » Wed Jul 29, 2009 4:59 am

But we don't know whether he called all the sunday 200 mins within the first 1000 mins or after 1000 mins. right?

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tngearhart: Senior | Next Rank: 100 Posts; Posts: 50; Joined: Tue Apr 18, 2006 5:41 pm; Thanked: 2 times; Followed by:1 members

by tngearhart » Wed Jul 29, 2009 1:55 pm

You may have misread the question. The phone company charges 1/2 it's normal charge for Sunday calls, regardless of whether the caller has made any other calls. So if I make 200 minutes of calls on Sunday only and no other calls during weekdays, my bill will be $10 for the month. the 1000 minute threshold only applies to calls made Monday thru Saturday.