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# easy one

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21 Feb 2005, 17:06
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

do it!
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22 Feb 2005, 06:04
the prices could be
1000$/1000L=1$/L and the new price
1000$/1200L=5/6$/L
so decrease is
1-5/6=1/6
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22 Feb 2005, 06:39
I think I've fallen into the trap ....why it's not 20% ?
1000/1200 ?
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22 Feb 2005, 06:51
the increase in volume is 20% whereas the decrease in price is 16.67%
easy but tricky
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22 Feb 2005, 06:52
Antmavel wrote:
I think I've fallen into the trap ....why it's not 20% ?
1000/1200 ?

why should it be 20% ? as you already pointed out 1000/1200=0,83*100=83,33=100-83,33=16,67%
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22 Feb 2005, 08:25
Another very good question type that has high likelyhood to appear in the real test, in my opinion.

This kind of question often appears this way: If something increased by 20%, then decreased by 20%, how much is the percentage of increase/decrease when the final value is compared to the initial value?
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22 Feb 2005, 15:17
Suppose price for 5x10x24 box is X

So if the price to size ratio remains same price for 6x10x24 shoud be 6X/5.

However the new price for 6x10x24 is X

so the diff is X/5

%Diff is [(X/5*100)]/(6X/5) = 16.67%
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22 Feb 2005, 18:46
HongHu wrote:
Another very good question type that has high likelyhood to appear in the real test, in my opinion.

This kind of question often appears this way: If something increased by 20%, then decreased by 20%, how much is the percentage of increase/decrease when the final value is compared to the initial value?

Yes, i agree with you. it is very likely question.
=x-x(1.2)(0.8)=x(1-0.96)=0.04x or 4%
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22 Feb 2005, 21:26
thearch wrote:
the increase in volume is 20% whereas the decrease in price is 16.67%
easy but tricky

I got it...
100 -> 1000$120 should be 1200$, however it's 1000$so decrease is (1200-1000)/ 1200 = 1/6 thanks for the help... GMAT Club Legend Joined: 07 Jul 2004 Posts: 5062 Location: Singapore Followers: 29 Kudos [?]: 282 [0], given: 0 [#permalink] ### Show Tags 23 Feb 2005, 02:06 initial: 5*10*20=1000 cm^3 now: 6*10*20 = 1200 cm^3 Price = x Price per cm^3 = 1200/x and 1000/x Difference = 200/x % price in fruit juice went down = 200/x * x/1000 *100 = 10% ??? I looked at the solution and didnt get what you meant by size to price ratio. What's the logic behind this ratio ?? VP Joined: 13 Jun 2004 Posts: 1118 Location: London, UK Schools: Tuck'08 Followers: 7 Kudos [?]: 36 [0], given: 0 [#permalink] ### Show Tags 23 Feb 2005, 07:10 ywilfred wrote: initial: 5*10*20=1000 cm^3 now: 6*10*20 = 1200 cm^3 Price = x Price per cm^3 = 1200/x and 1000/x Difference = 200/x % price in fruit juice went down = 200/x * x/1000 *100 = 10% ??? I looked at the solution and didnt get what you meant by size to price ratio. What's the logic behind this ratio ?? I know why you found 10%, you've made a small mistake in your calculation, the price per cm3 should be x/1200 and x/1000 let's say that the standard price is 1000$ for 1000cm3 , it goes like this :
1000/1000 and 1000/1200 ; 1 and 5/6
there is a decrease of 1/6 on the price, which means 16.6%

There is no special logic behind it, except the double meaning : increase in volume OR decrease in price -> % are not always equal...
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23 Feb 2005, 07:29
Fred,

My BAD, I should have put the word like this

If the Price is directly proportional to Size the price of the box 6X10X24 should be

[x/(5X10X24)]x(6X10X24) = 6x/5.

Hope it is clear now

Pankaj
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23 Feb 2005, 07:49
MA wrote:
HongHu wrote:
Another very good question type that has high likelyhood to appear in the real test, in my opinion.

This kind of question often appears this way: If something increased by 20%, then decreased by 20%, how much is the percentage of increase/decrease when the final value is compared to the initial value?

Yes, i agree with you. it is very likely question.
=x-x(1.2)(0.8)=x(1-0.96)=0.04x or 4%

:b: Decrease or increase?
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23 Feb 2005, 19:52
Ah.. i get it now..
should be a percentage decrease, isn't ??
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23 Feb 2005, 22:28
HongHu wrote:
:b: Decrease or increase?

=[{x (1.2) (0.8)} - x]/x
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23 Feb 2005, 23:55
Good job!
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25 Feb 2005, 15:24
20/120 * 100 = 1/6*100 = 16.6667%
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