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From 1984 to 1987, the value of foreign goods consumed annually in the

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rigger
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From 1984 to 1987, the value of foreign goods consumed annually in the [#permalink] New post  19 Oct 2005, 20:05
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From 1984 to 1987, the value of foreign goods consumed annually in the United States increased by what percent?

(1) In 1984 the value of foreign goods consumed constituted 19.8% of the total value of goods consumed in the United States that year
(2) In 1987 the value of foreign goods consumed constituted 22.7% of the total value of goods consumed in the United States that year.
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gsr
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Re: From 1984 to 1987, the value of foreign goods consumed annually in the [#permalink] New post  19 Oct 2005, 20:28
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I get E

Value of foreign goods in 1984 - a
Total value of goods in 1984 - x
Value of foreign goods in 1987 - b
Total value of goods in 1984 - y

Need to find -> ((b-a)/a)*100

A) Insuff. a = 19.8%(x)
B) Insuff. b = 22.7%(y)

Together,
((b-a)/a)*100 = [22.7y-0.198x]*100/0.198x
We don't know x and y. So Insuff.
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rigger
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Re: From 1984 to 1987, the value of foreign goods consumed annually in the [#permalink] New post  19 Oct 2005, 20:33
Okay, I am stupid. I just realized my mistake. The OE is E
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gsr
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Re: From 1984 to 1987, the value of foreign goods consumed annually in the [#permalink] New post  19 Oct 2005, 20:37
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did you assume x=y :?:
Don't worry, we all make mistakes. Otherwise everyone will end up with 800!! :)
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ywilfred
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Re: From 1984 to 1987, the value of foreign goods consumed annually in the [#permalink] New post  19 Oct 2005, 21:27
Let total value consumed in 1984 be n1, and total vlaue consumed in 1987 be n2.

From (1), in 1984: Value of foreign god consumed = 19.8%*n1. Not sufficient as we have no information about n1, and value consumed in 1987.

From (2), in 1987, value of foreign good consumed = 22.7% *n2. Not sufficient as we have no information about n2 and value consuemd in 1984

using both, we have no values for n1 and n2 still.

Ans: E
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Re: From 1984 to 1987, the value of foreign goods consumed annually in the [#permalink] New post  19 Oct 2005, 21:37
Yep, E
we don't kow the total value of goods consumed in the United States for both year. We can not assumed that the value was the same.
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rigger
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Re: From 1984 to 1987, the value of foreign goods consumed annually in the [#permalink] New post  19 Oct 2005, 22:11
gsr,

yup, i made the mistake of assume x = y. Actually, the majority of my mistakes on the DS is when I make quick assumptions. Hopefully, on the GMAT test I will be more thorough.

cheers,
rigger
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siddhans
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Re: From 1984 to 1987, the value of foreign goods consumed annually in the [#permalink] New post  30 Sep 2011, 17:45
gsr wrote:
I get E

Value of foreign goods in 1984 - a
Total value of goods in 1984 - x
Value of foreign goods in 1987 - b
Total value of goods in 1984 - y

Need to find -> ((b-a)/a)*100

A) Insuff. a = 19.8%(x)
B) Insuff. b = 22.7%(y)

Together,
((b-a)/a)*100 = [22.7y-0.198x]*100/0.198x
We don't know x and y. So Insuff.


How does 22.7 stay the same but 19.8 become 0.198 in the combined equation?
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gautammalik
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Re: From 1984 to 1987, the value of foreign goods consumed annually in the [#permalink] New post  01 Oct 2011, 00:37
rigger wrote:
This is from the OG. I got an answer that was different from the OG, but I think I am right??

From 1984 to 1987, the value of foreign goods consumed annually in the United States increased by what percent?

1) In 1984 the value of foreign goods consumed constituted 19.8% of the total value of goods consumed in the United States that year

2) In 1987 the value of foreign goods consumed constituted 22.7% of the total value of goods consumed in the United States that year.


Answer should be E
because we don't know the % increase of years 1985 and 1986
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siddhans
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Re: From 1984 to 1987, the value of foreign goods consumed annually in the [#permalink] New post  01 Oct 2011, 02:15
gsr wrote:
I get E

Value of foreign goods in 1984 - a
Total value of goods in 1984 - x
Value of foreign goods in 1987 - b
Total value of goods in 1984 - y

Need to find -> ((b-a)/a)*100

A) Insuff. a = 19.8%(x)
B) Insuff. b = 22.7%(y)

Together,
((b-a)/a)*100 = [22.7y-0.198x]*100/0.198x
We don't know x and y. So Insuff.


How does 22.7 stay the same but 19.8 become 0.198 in the combined equation?
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Re: From 1984 to 1987, the value of foreign goods consumed [#permalink] New post  03 Jun 2015, 10:50
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rigger wrote:
This is from the OG. I got an answer that was different from the OG, but I think I am right??

From 1984 to 1987, the value of foreign goods consumed annually in the United States increased by what percent?

1) In 1984 the value of foreign goods consumed constituted 19.8% of the total value of goods consumed in the United States that year

2) In 1987 the value of foreign goods consumed constituted 22.7% of the total value of goods consumed in the United States that year.


To calculate the Percentage Increase we need to know the value of Foreign good consumed in year 1984 and the value of Foreign good consumed in year 1987

Statement 1: 1) In 1984 the value of foreign goods consumed constituted 19.8% of the total value of goods consumed in the United States that year
No information about 1987 foreign good consumed with respect to the foreign good consumed in year 1983 or 1984 so
NOT SUFFICIENT

Statement 2: In 1987 the value of foreign goods consumed constituted 22.7% of the total value of goods consumed in the United States that year
No information about 1984 foreign good consumed with respect to the foreign good consumed in year 1986 or 1987 so
NOT SUFFICIENT

Combining The two statements:
There is no connect from Year 1984 to 1986 to relate the Foreign good consumed in 1984 and 1987
Hence, NOT SUFFICIENT

Answer: Option
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E
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Re: From 1984 to 1987, the value of foreign goods consumed annually in the [#permalink] New post  24 Dec 2015, 21:33
2 percentage values alone are not sufficient to comapre two quantities

For example 50% of x is not always greater than 10% of y. What if x = 5 and y is 8342193487

Both statements together are insufficient.

E
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Re: From 1984 to 1987, the value of foreign goods consumed annually in the [#permalink] New post  19 Jan 2023, 07:42
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Re: From 1984 to 1987, the value of foreign goods consumed annually in the [#permalink]
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