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Untitled.jpg I have no idea how they are getting this

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Manager
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Untitled.jpg I have no idea how they are getting this [#permalink]

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New post 25 Jul 2008, 05:50
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I have no idea how they are getting this
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Re: PS-GMATprep [#permalink]

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New post 25 Jul 2008, 06:03
apurva1985 wrote:
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I have no idea how they are getting this


LeeMay = .6*May
May = LeeMay + .4*May

June = 1.2*LeeMay + .4*May
June = 1.2*0.6*May + .4*May
June = .72*May + .4*May
June = 1.12*May

Lee as % of June total = .72*May / 1.12*May = .72/1.12 = 64%

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Manager
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Re: PS-GMATprep [#permalink]

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New post 25 Jul 2008, 06:13
Now this is the hight

I solved this ut i made one blunder

I had solved it like this
Let the total family income be 100 therefore Lees component is 60----this is for may

Now in the june month
It increases by 20% so it bcomes 72.
Now the mistake i did was i kept the total constant as 100 so i was getting 72%............which should have been made to 112..thanks. I hope i dont do this types of mistake on D day
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Re: PS-GMATprep [#permalink]

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New post 25 Jul 2008, 06:15
Zoinnk is absolutely correct. This is a tricky question at first glance and my instinct is to go for the 72% as well. I guess the idea is that just her income is going up, not everyone else's.

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Re: PS-GMATprep [#permalink]

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New post 25 Jul 2008, 06:25
Mrs Lee's income in May = m
Mrs Lee's income in June = M
Lee family's total income = T

In May,
m=0.6T

In June,
M=1.2m=1.2*0.6*T=0.72T


So 72%

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Re: PS-GMATprep [#permalink]

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New post 25 Jul 2008, 06:31
judokan wrote:
Mrs Lee's income in May = m
Mrs Lee's income in June = M
Lee family's total income = T

In May,
m=0.6T

In June,
M=1.2m=1.2*0.6*T=0.72T


So 72%


2nd trial:
Mrs Lee's income in May = m
Mrs Lee's income in June = M
Lee family's total income in May = t
Lee family's total income in June = T

In May,
m=0.6t

In June,
M=1.2m=1.2*0.6*t=0.72t
T=t+0.2*0.6*t=1.12t

M/T=0.72/1.12=64%

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Senior Manager
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Re: PS-GMATprep [#permalink]

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New post 25 Jul 2008, 06:58
This question is very tricky. First I calculated 0.72 as you did. (0.72M)/M

But, we the question is asking the following 0.72M/1.12M= 0.64

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Re: PS-GMATprep [#permalink]

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New post 25 Jul 2008, 13:15
apurva1985 wrote:
Attachment:
Untitled.jpg

I have no idea how they are getting this


take $100 as base total FAMILY income in May

May $60 (L) $40 (R) R -rest of family
June $60*1.2 $40 (R)

% incrate= ($72)/($72+$40) *100 = 64%
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Re: PS-GMATprep   [#permalink] 25 Jul 2008, 13:15
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