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Bunuel
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12 Days of Christmas Competition
This question is part of our holiday event
Win $40,000 in prizes: courses, tests, and more


An investor purchases a no interest certificate that he cannot sell for 2 years. He buys certificates with a total purchase price of $2,400. At the same time, he invests an additional sum in a treasury bond that earns 3% simple interest per year.

The investor’s goal is a combined net gain of $600 from the two investments after 2 years.

Two analysts give different projections for how the certificate’s market value will change over the two years. Under the optimistic projection, each year the market value increases by a fixed amount equal to 5% of the original $2,400 purchase price. Under the pessimistic projection, each year the market value decreases by a fixed amount equal to 10% of the original $2,400 purchase price.

In the table, select for Bond investment, optimistic the amount the investor must invest in the bond to reach the $600 goal under the optimistic scenario, and select for Bond investment, pessimistic the amount the investor must invest in the bond to reach the $600 goal under the pessimistic scenario. Make only two selections, one in each column.

Optimistic gain = 10% of 2400 = 240
Pessimistic loss =-20% of 2400 = -480

p*3*2/100 = SI

Optimistic
p*0.06 = 360
p =6000

Pessimistic
p*0.06 = 1080
p =18000

Correct Answer:

Optimistic: 6000
Pessimistic: 18000
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let x - amount invested in bond
Given:
After 2 years : gain from bond - 2*3*x/100
optimistic -> +240 from certificate hence from other will need only 600 - 240 = 360 => 360 = 6x/100
pessimistic -> -480 loss from certificate hence from other will need 600 + 480 = 1080 => 1080 = 6x/100

solving above we get optimistic: 6k and pessimistic: 18k
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5% of 2400 = 120
10% of 2400 = 240
3% simple interest

optimistic:
2*120 + 2*0.03x = 600
240 + 0.06x = 600
0.06x = 360
x = 6000

pessimistic:
2*(-240) + 2*0.03x = 600
-480 + 0.06x = 600
0.06x = 1080
x = 18000

Bond investment, optimistic=6000
Bond investment, pessimistic=18000
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Let the invested amount in bonds be B
Total required value of both investments at the end of 2 years = $2400+ bond investment (B) + $600
Basically the question says: gain from certificate + gain from bond = $600

(1) Optimistic projection
Increases by a fixed amount (meaning simple interest) = 5% of 2400 = $120
Over 2 years, gain from certificate =$240
Required bond gain = 600-240 = $360, which is equal to 3/100 x 2 x b
Hence B = 360000/6 = $6000

(2) Pessimistic projection
Decreases by a fixed amount (meaning simple interest) = 10% of 2400 = $240
Over 2 years, loss from certificate = $480
Required bond gain = 600+480 = $1080
Hence B = 1080 x 100/6 = $18000
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Given information:
Certificate purchase price => 2400 => no interest but market value changes
Investment horizon => 2 years
Treasury bond earns => 3% SI per year
Target => total net gain = 600 after 2 years

So total final value - total initial investment = 600

Certificate value
=> optimistic
value increases by 5% of the original 2400 => 120 per year => 240 for 2 years=> total = 2640 => gain => 240
=> pessimistic => value decreases 10% each year from 2400=. - 240 for 1 year => -480 for 2 years => 2400 - 480 = 1920

Required bond gain in each scenario
=> optimistic => total desired - certificate = 600 - 240 => 360
=>pessimistic case => 600+480 => 1080

Bond interest calculation => earns 3% SI per year => interest = 2* 0.03 => 0.06 = 6%
=> optimistic => 0.06 * B = 360 => B = 6000
=> pessimistic => 0.06 * B =1080 => 18000

Final selections => optimistic = 6000, pessimistic = 18000
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Let principal amount invest in Bond = B
Bond interest in 2 years = Principal amt*2*3/100 = B*0.03*2 = 0.06B

Under optimistic projection,
Certificate gain = 5/100 * 2400 = 120 every yr
For 2 years, gain = 120*2 = 240

Goal: 240+0.06B = 600 => B=6000

Under pessimistic projection,
Certificate loss = 10/100 * 2400 = 240/yr
Loss for 2 years = 240*2 = 480

Goal: 0.06B + (-480) = 600 => 0.06B = 1080 => B = 18000

Optimistic investment = 6000
pessimistic investment = 18000

Bunuel
Gift
12 Days of Christmas Competition
This question is part of our holiday event
Win $40,000 in prizes: courses, tests, and more


An investor purchases a no interest certificate that he cannot sell for 2 years. He buys certificates with a total purchase price of $2,400. At the same time, he invests an additional sum in a treasury bond that earns 3% simple interest per year.

The investor’s goal is a combined net gain of $600 from the two investments after 2 years.

Two analysts give different projections for how the certificate’s market value will change over the two years. Under the optimistic projection, each year the market value increases by a fixed amount equal to 5% of the original $2,400 purchase price. Under the pessimistic projection, each year the market value decreases by a fixed amount equal to 10% of the original $2,400 purchase price.

In the table, select for Bond investment, optimistic the amount the investor must invest in the bond to reach the $600 goal under the optimistic scenario, and select for Bond investment, pessimistic the amount the investor must invest in the bond to reach the $600 goal under the pessimistic scenario. Make only two selections, one in each column.
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Optimistic projection: the investor will earn \(2400*0.05*2=240\)
Then, she'll need to compensate \(600-240=360\) dollars from her desired gain, which will represent \(0.03*2=0.06\) of her investment.
Therefore, she must invest \(360/0.06 = 6000\) in bonds.

Pessimistic projection: the investor will lose \(2400*0.1*2=480\)
Then, she'll need to earn \(600+480=1080\) dollars to have a gain of 600.
Therefore, she must invest \(1080/0.06=18000\) dollars in bonds.

The answer is 6k for Optimistic and 18k for Pessimistic.
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To solve this problem we must calculate the required treasury bond investment to achieve a combined net gain of $600 after 2 years under two different market projections for the certificate

Treasury bond gain :
Bond Earns 3% simple interest per year.
Over 2 years , the total int earned is 3% + 3 % = 6% (0.06) of the principal invested.

Certificate projection
Optimistic : The value increases by 5% of original $2400 price each year.
Annual Gain : 0.05x 2400=120
Total 2 year gain = 120 x 2= 240

pessimistic : Value decreases by 10% of the original 2400 each year
Annual loss : 0.10x2400 = 240
Total 2 year loss = 480

Optimistic scenario :
Net gain of $600
Target bond gain = Total Goal - Certificate gain , 600 - 240 = 300
Investment (P) : Px 0.06 = 360 , P = 6000.✅

Pessimistic scenario :
Investor still aims for a $600 net gain but must now offset a significant certificate loss.
Target Bond Gain = Total Goal + Certificate loss
Target Bond Gain = 600 + 480 = 1080
Required Investment : P x 0.06 = 1080 = 18000✅
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Given the total profit should be 600
with optimistic projection each year 2400 certificate amount gives 5% which is 120. For two years 240 will be gained
Hence for 360 balance using simple interest formula he needs to invest 6000

with pessimistic projection each year 2400 loses 10% which is 480 loss for 2 years. Hence to gain 600 net through simple interest the profit should be 1080
Hence he needs to invest 18000
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