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codesnooker: Legendary Member; Posts: 543; Joined: Fri Jan 18, 2008 1:01 am; Thanked: 43 times; GMAT Score:580

by codesnooker » Wed Jul 30, 2008 1:37 am

How to solve this problem? Do I need to learn about credit card system for it?

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Source: Beat The GMAT — Data Sufficiency | Wed Jul 30, 2008 1:37 am

Vignesh.4384: Master | Next Rank: 500 Posts; Posts: 443; Joined: Sat Jun 28, 2008 6:33 pm; Thanked: 5 times

by Vignesh.4384 » Wed Jul 30, 2008 4:24 am

IMO D.

If my answer is right then i wil explain.

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augusto: Senior | Next Rank: 100 Posts; Posts: 57; Joined: Sun Jun 22, 2008 10:01 pm; Location: UK; Thanked: 7 times

by augusto » Wed Jul 30, 2008 8:15 am

I agree, it's D

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dellybean: Junior | Next Rank: 30 Posts; Posts: 10; Joined: Tue Jul 08, 2008 3:24 pm

by dellybean » Wed Jul 30, 2008 3:39 pm

Yup, D. You don't need to know about credit cards, just averages.

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preetha_85: Senior | Next Rank: 100 Posts; Posts: 95; Joined: Sun Jul 06, 2008 6:41 am; Location: INDIA; Thanked: 2 times

by preetha_85 » Wed Jul 30, 2008 7:40 pm

Hi

Can u please explain as to why B alone is suff.. I got A as the answer..
I thought B was insufficient since we do not know when the 300$ is getting added to the billing cycle...

Thanks in advance

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mals24: Legendary Member; Posts: 683; Joined: Tue Jul 22, 2008 1:58 pmFollowed by: 2 members; Location: Dubai; Thanked: 73 times

by mals24 » Thu Jul 31, 2008 6:15 am

According to the question the beginning balance of the a/c was 600.

St 1. Jane's payment was credited on the 21st day of the billing cycle.
Which means for the first 20 days the avg was 600 and for the remaining 10 days the bal was 300: (600*20+300*10)/30
St 1 is suff.

St 2. The average daily balance through the 25th day of the billing cycle was $540.
Hence the a/c was credited before the 25th day of the month.
Let X be the number of days the a/c balance was 600. Hence 25-X represents the days the a/c bal was 300.
(600*X+300*(25-X))/25 = 540
Solve for X and find the avg.
St 2 is suff
Answer: D

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codesnooker: Legendary Member; Posts: 543; Joined: Fri Jan 18, 2008 1:01 am; Thanked: 43 times; GMAT Score:580

by codesnooker » Fri Aug 01, 2008 8:11 am

Thanks. Answer is (D)

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