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why the they have given cd consuming 10% gain and 5% loss if its of no use....
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Mohit1994, i have the same question exactly!!

MartyMurray can you please answer this?
the question gives same answers without considering "CD assuming 10% gain ..." and "CD assuming 5% loss ..."

I dont understand their significance here, rather they made me confused and mark the wrong answer thinking whatever cd's value comes, it should be adjusted for some 10% gain or 5% loss.

KarishmaB can you please help here?
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Mohit1994, i have the same question exactly!!

MartyMurray can you please answer this?
the question gives same answers without considering "CD assuming 10% gain ..." and "CD assuming 5% loss ..."

I dont understand their significance here, rather they made me confused and mark the wrong answer thinking whatever cd's value comes, it should be adjusted for some 10% gain or 5% loss.
Hi guys.

Consider this language in the passage:

In the table, select for CD assuming 10% gain the amount the investor should invest in the CD to meet her goal under the assumption that the stock price will have increased by 10% at the end of one year, and select for CD assuming 5% loss the amount she should invest in the CD to meet her goal under the assumption that the stock price will have decreased by 5% at the end of one year.

We see that the point is not that there has been a 10% gain or 5% loss on the CD. Rather, the CD generates the same rate of return in either scenario, and the stock price is assumed to have increased 10% or decreased by 5%.

In other words, "CD assuming 10% gain" is short for "the amount that must be invested in the CD assuming a 10% gain in the stock price," and "CD assuming 5% loss" is short for "the amount that must be invested in the CD assuming a 5% loss in the stock price."

Hope that helps.
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Why not include CD 2% simple interest annually?

MartyMurray
An investor will use $2,000 to purchase 10 shares of a certain stock at $200 per share. At the same time, she will invest another sum of money in a certificate of deposit (CD) that earns 2% simple interest annually. The investor would like to know how much money she should invest in the CD to meet her goal of net earnings (before any taxes or other fees) of $360 from the two investments at the end of one year.

In the table, select for CD assuming 10% gain the amount the investor should invest in the CD to meet her goal under the assumption that the stock price will have increased by 10% at the end of one year, and select for CD assuming 5% loss the amount she should invest in the CD to meet her goal under the assumption that the stock price will have decreased by 5% at the end of one year. Make only two selections, one in each column.


This question is fairly straightforward. So, our goals in answering it will be to execute well so that we don't somehow arrive at an incorrect answer and to answer it relatively quickly to bank extra time for harder questions.

Since the timeframe for the stock price change is one year and the return on the CD is simple annual interest, to determine how much she should invest in the CD, we can use the following:

    Return on Stock + Return on CD = 360

    Return on CD = 360 - Return on Stock

    0.02(Amount Invested in CD) = 360 - Return on Stock

Now, one thing we can do to answer this question quickly is notice that the fact that the specific way she invested $2000 in the stock was by purchasing 10 shares at $200 per share doesn't matter. Regardless of how many shares she bought or the price of those shares, the value of her $2000 stock investment will increase or decrease by the same percentage as the increase or decrease in the stock price.

So, if the stock price price increases 10% and we let \(C_1\) be the amount she should invest in the CD when the return on the stock is 10%, we have the following:

    \(0.02C_1 = 360 - 0.10(2000)\)

    \(0.02C_1 = 360 - 200\)

    \(0.02C_1 = 160\)

    \(C_1 = 8000\)

If the stock price decreases 5% and we let \(C_2\) be the amount she should invest in the CD when the return on the stock is -5%, we have the following:

    \(0.02C_2 = 360 - (-0.05(2000))\)

    \(0.02C_2 = 360 + 100\)

    \(0.02C_2 = 460\)

    \(C_2 = 23,000\)

Correct Answer
8000, 23,000
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Why not include CD 2% simple interest annually?



We are including the 2% interest earned on a CD.
The question is this: "how much should we invest in a CD to make a total return amount of $360 assuming that a stock investment of $2000 gives 10% profit"

If the stock investment gives 10% on $2000, it means that the stick investment gives $200.
So the rest of the $360 - $200 = $160 will come from the CD investment.

CD gives 2% on the invested amount and this 2% should be equal to $160

\(\frac{2}{100} * CD investment = 160\)

CD investment = $8000
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does it mean that the 'assumption' of gain or loss here is meaningless.
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does it mean that the 'assumption' of gain or loss here is meaningless.

No, it is not meaningless. It tells us how much we earned from the stock and what is remaining. The remaining is what we have to earn from the CD. That is the figure we need to find.
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Hi Marty, I have one doubt in the solution you have posted. Can u please share why haven't you done : .02C1=360-1.1(2000) fr 1st part and .02C1=360-.95(2000) for 2nd part..considering 10% increase in stock price and 5% decrease in stock price is mentioned in argument. I know my doubt may be silly but it would be grateful if you can find some time to clarify my doubt. Actually because of this doubt I marked wrong answer during Mock.
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Hi Marty can you please explain why you didn't write : .02 C1 = 360- 1.1 (2000) FOR 1ST PART and .02C1 = 360- .95 (2000) FOR 2ND PART in your solution considering 10% increase and 5% loss in stock price mentioned in argument. Please clarify my doubt whenever u feel free. It may be silly but because of this doubt i marked this qtn wrong during mock.
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This is a very confusingly worded, two-part analysis DI question. The underlying math is in fact straightforward and easy, but the table's verbiage is not.

With regard to MBA readiness, it also helps to have a basic understanding of investing for this one: in particular, the difference between stock shares (which experience variable gains and losses) vs. CDs (which usually offer fixed interest rates).

The goal is to profit $360 from both investments.  We are already told that the CD gains exactly 2% per year, simple interest. Thus, when it says in the table "CD assuming 10% gain," we must assume this to mean a 10% gain in the $2,000 the investor bought in stock shares, despite the fact that the table's wording is deceptive, and instead suggests—nonsensically—that the CD is making this gain.  

(2000)(.1) = 200, so there is $160 left in profit to make from the 2% CD to reach $360.

.02a = $160, a = $8,000

Likewise, when it says in the table "CD assuming 5% loss," we must assume this to mean a 5% loss from the $2,000 of shares the investor bought in stock, not a 5% loss from the CD itself.

(2000)(-.05) = -100, so there is $460 left in profit to make from the 2% CD to reach $360.

.02b = 460, b = $23,000­
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target income = 360
Amount invested in stock = 2000
If he makes 10% gain on the stock , that amount can be deducted from the target income.
10% of 2000 = 200
Hence 160 = x * 2/100
x= 8000

If he makes 5% loss , that amount has to be earned in addition to the target income.
5% of 2000 = 100
460 = x * 2/100
x= 23000

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Total gain/loss in investment in stocks: S
Total gain in investment in CD: C
S + C = 360

Amount invested in CD: M
C = 2% * M­

10% gains in stock price
=> S = 2000 * 10% = 200
=> C = 360 - 200 = 160
=> M = \(160 \div 2\)% = 8000


5% loss in stock price
=> S = - 2000 * 5% = - 100
=> C = 360 - ( - 100) = 460
=> M = \(460 \div 2\)% = 23,000
 ­
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Thanks for the straightfoward solution to this question. I have 1 doubt about it though:
If the stock price increases by 10%, shouldn't it be $200*(110%)? And if it decreases by 5%, shouldn't it be $200*(95%)? As $200 is the price per share. Can you pls explain why we multiply 2000 with 10% and 2000 with -5% in the 2 equations? Thanks.
MartyMurray
An investor will use $2,000 to purchase 10 shares of a certain stock at $200 per share. At the same time, she will invest another sum of money in a certificate of deposit (CD) that earns 2% simple interest annually. The investor would like to know how much money she should invest in the CD to meet her goal of net earnings (before any taxes or other fees) of $360 from the two investments at the end of one year.

In the table, select for CD assuming 10% gain the amount the investor should invest in the CD to meet her goal under the assumption that the stock price will have increased by 10% at the end of one year, and select for CD assuming 5% loss the amount she should invest in the CD to meet her goal under the assumption that the stock price will have decreased by 5% at the end of one year. Make only two selections, one in each column.


This question is fairly straightforward. So, our goals in answering it will be to execute well so that we don't somehow arrive at an incorrect answer and to answer it relatively quickly to bank extra time for harder questions.

Since the timeframe for the stock price change is one year and the return on the CD is simple annual interest, to determine how much she should invest in the CD, we can use the following:


Return on Stock + Return on CD = 360

Return on CD = 360 - Return on Stock

0.02(Amount Invested in CD) = 360 - Return on Stock

Now, one thing we can do to answer this question quickly is notice that the fact that the specific way she invested $2000 in the stock was by purchasing 10 shares at $200 per share doesn't matter. Regardless of how many shares she bought or the price of those shares, the value of her $2000 stock investment will increase or decrease by the same percentage as the increase or decrease in the stock price.

So, if the stock price price increases 10% and we let \(C_1\) be the amount she should invest in the CD when the return on the stock is 10%, we have the following:


\(0.02C_1 = 360 - 0.10(2000)\)

\(0.02C_1 = 360 - 200\)

\(0.02C_1 = 160\)

\(C_1 = 8000\)

If the stock price decreases 5% and we let \(C_2\) be the amount she should invest in the CD when the return on the stock is -5%, we have the following:


\(0.02C_2 = 360 - (-0.05(2000))\)

\(0.02C_2 = 360 + 100\)

\(0.02C_2 = 460\)

\(C_2 = 23,000\)

Correct Answer
8000, 23,000
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I have a doubt on this too. I thought it should be 0.02C = 360 - 200*(110%) and 0.02C = 360 - 200*(95%) since 200 is the price per share. Though i am not getting the answers with these equations, I want to know the logic of why we multiply 2000 with 10% and 2000 with -5%. Can someone pls explain the logic for this?
DEV2022
Hi Marty, I have one doubt in the solution you have posted. Can u please share why haven't you done : .02C1=360-1.1(2000) fr 1st part and .02C1=360-.95(2000) for 2nd part..considering 10% increase in stock price and 5% decrease in stock price is mentioned in argument. I know my doubt may be silly but it would be grateful if you can find some time to clarify my doubt. Actually because of this doubt I marked wrong answer during Mock.
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