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23 May 2020, 04:45
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
74% (00:56) correct
26%
(00:58)
wrong
based on 748
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An initial investment of $10,000 was deposited in a bank account one year ago, and additional deposits were made during the year. If no withdrawals were made, what was the total amount of interest earned on this account during the year?
(1) The additional deposits during the year totaled $5,000.
(2) The account earned interest at the annual rate of 6 percent compounded quarterly.
ID: 700129
DS21192
(1) The additional deposits during the year totaled $5,000.
(2) The account earned interest at the annual rate of 6 percent compounded quarterly.
ID: 700129
DS21192
24 May 2020, 10:36
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Bunuel
Given: An initial investment of $10,000 was deposited in a bank account one year ago, and additional deposits were made during the year.
Target question: What was the total amount of interest earned on this account during the year?
Statement 1: The additional deposits during the year totaled $5,000.
Since we have no information about the interest rate, statement 1 is NOT SUFFICIENT
Statement 2: The account earned interest at the annual rate of 6 percent compounded quarterly.
Since we have no information about the additional deposits, statement 2 is NOT SUFFICIENT
Statements 1 and 2 combined
Even when we combine two statements, there is still no way to answer the target question with certainty, since we have no idea WHEN the additional $5000 was deposited.
Better understand why, let's say the original $10,000 was deposited on January 1, 2019
Now consider these two possible cases:
Case a: The additional $5000 was deposited on January 1, 2019.
In this case, 1 year's interest was collected on the original $10,000 AND 1 year's interest was collected on the additional $5000
So, the TOTAL interest = 6% of $15,000
Case b: The additional $5000 was deposited at 11:59 pm on December 31, 2019.
In this case, 1 year's interest was collected on the original $10,000 AND no interest was collected on the additional $5000
So, the TOTAL interest = 6% of $10,000
As we can see, the two different cases yield different values of the TOTAL interest
So, the combined statements are NOT SUFFICIENT
Answer: E
Cheers,
Brent
General Discussion
Siak0730
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23 May 2020, 05:36
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principal = 10,000
additional deposits be x (but we still don't know whether these deposits be equal and periodic)
rate be r%
time = 1 year (during the year)
now, we need to find interest earned on the account, lets assume it to be I.
simple formulas regarding compound and simple interest, to know about variables:
I = Amount- Principal
Amount = Principal*(1+[(r/(n*100)))^(n*t)]
if interest rate is compound interest
I = Amount- Principal
Amount = Principal*(1+(r*t))
if rate is simple interest
1. additional deposits total = 5000
not sufficient since we don't know what and how much rate of interest is?
2. Rate of interest = 6% compounded quarterly
ok, we have rate now and its 6% and compounded quarterly
but we don't have the additional deposits and their details.
therefore, A, B, D --> x
we have to find an answer from C, and E.
combining both the information from 1 and 2, we get
additional deposits = 5000
rate= compounded quarterly, 6%
Again, not sufficient as we don't have sufficient information regarding additional deposits, As in how many installments and these installments are periodic or not, and these individual additional deposits are equal or not.
Therefore, E.
additional deposits be x (but we still don't know whether these deposits be equal and periodic)
rate be r%
time = 1 year (during the year)
now, we need to find interest earned on the account, lets assume it to be I.
simple formulas regarding compound and simple interest, to know about variables:
I = Amount- Principal
Amount = Principal*(1+[(r/(n*100)))^(n*t)]
if interest rate is compound interest
I = Amount- Principal
Amount = Principal*(1+(r*t))
if rate is simple interest
1. additional deposits total = 5000
not sufficient since we don't know what and how much rate of interest is?
2. Rate of interest = 6% compounded quarterly
ok, we have rate now and its 6% and compounded quarterly
but we don't have the additional deposits and their details.
therefore, A, B, D --> x
we have to find an answer from C, and E.
combining both the information from 1 and 2, we get
additional deposits = 5000
rate= compounded quarterly, 6%
Again, not sufficient as we don't have sufficient information regarding additional deposits, As in how many installments and these installments are periodic or not, and these individual additional deposits are equal or not.
Therefore, E.
