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chetan2u
Allen invested 2400 dollars for one year earning y percent simple interest and Taya invested x dollars for one year earning y percent simple interest. What is the value of y?


(1) The ratio of Tanyas earned interest to Allen earned interest was 3%
This simply tells us value of x.
The ratio of the amount 2400:x will be same as ratio of the interest as rest all variables are same . Time is 1 year and rate is y%.
So, nothing about y
Insuff

(2) Allen earned 168 dollars in interest
This will give us y straight.
\(I=\frac{PRT}{100}........168=\frac{2400*y*1}{100}.......168=24y.....y=7%\)
Suff

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Bunuel, typos
Taya should be Tanya and ratio may be 3 and not 3%.

Hey chetan2u

taking statement 1, I can just solve for x, which amounts to 2400. Hence, setting both equations equal, just shows that they contain the same components resulting in no new information about y.
Am I right?
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rudywip
chetan2u
Allen invested 2400 dollars for one year earning y percent simple interest and Taya invested x dollars for one year earning y percent simple interest. What is the value of y?


(1) The ratio of Tanyas earned interest to Allen earned interest was 3%
This simply tells us value of x.
The ratio of the amount 2400:x will be same as ratio of the interest as rest all variables are same . Time is 1 year and rate is y%.
So, nothing about y
Insuff

(2) Allen earned 168 dollars in interest
This will give us y straight.
\(I=\frac{PRT}{100}........168=\frac{2400*y*1}{100}.......168=24y.....y=7%\)
Suff

B


Bunuel, typos
Taya should be Tanya and ratio may be 3 and not 3%.

Hey chetan2u

taking statement 1, I can just solve for x, which amounts to 2400. Hence, setting both equations equal, just shows that they contain the same components resulting in no new information about y.
Am I right?


Hi,

you are right that statement I does not talk of y. The value of x will be 7200, and I have just added why it would be so in the earlier post.
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chetan2u
rudywip
chetan2u
Allen invested 2400 dollars for one year earning y percent simple interest and Taya invested x dollars for one year earning y percent simple interest. What is the value of y?


(1) The ratio of Tanyas earned interest to Allen earned interest was 3%
This simply tells us value of x.
The ratio of the amount 2400:x will be same as ratio of the interest as rest all variables are same . Time is 1 year and rate is y%.
So, nothing about y
Insuff

(2) Allen earned 168 dollars in interest
This will give us y straight.
\(I=\frac{PRT}{100}........168=\frac{2400*y*1}{100}.......168=24y.....y=7%\)
Suff

B


Bunuel, typos
Taya should be Tanya and ratio may be 3 and not 3%.

Hey chetan2u

taking statement 1, I can just solve for x, which amounts to 2400. Hence, setting both equations equal, just shows that they contain the same components resulting in no new information about y.
Am I right?


Hi,

you are right that statement I does not talk of y. The value of x will be 7200, and I have just added why it would be so in the earlier post.

Thanks, I got it now. I just misread the question before and therefore made a mistake when solving it.
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