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- perwinsharma
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So we're trying to find ALL consumer installment credit, let's call that Q.
So at the end of the year we know that 36% of Q comes from automobile installment credit. So we need to figure out the number for automobile installment credit, and then we can solve for Q. We're told that 57 billion is 1/3 of the automobile installment credit amount. So the full amount of automobile installment credit (in billions) is: 57*3 (since 1/3 of the amount is 57 billion, we multiply by 3 to find the full amount. This gives 171 (billion).
So going back to the stem we know that 36% of outstanding consumer credit (which we are calling Q) comes from automobile credit. So 171 is 36% of what number?
.36*Q=171
Q=171/.36
Q=475
So at the end of the year we know that 36% of Q comes from automobile installment credit. So we need to figure out the number for automobile installment credit, and then we can solve for Q. We're told that 57 billion is 1/3 of the automobile installment credit amount. So the full amount of automobile installment credit (in billions) is: 57*3 (since 1/3 of the amount is 57 billion, we multiply by 3 to find the full amount. This gives 171 (billion).
So going back to the stem we know that 36% of outstanding consumer credit (which we are calling Q) comes from automobile credit. So 171 is 36% of what number?
.36*Q=171
Q=171/.36
Q=475
- GMATinsight
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Automobile Installment Credit = (36/100) x all Outstanding Credit
Given $57 Billion = (1/3) x Automobile Installment Credit
i.e.$57 Billion = (1/3) x (36/100) x all Outstanding Credit
i.e. all Outstanding Credit = (100/36) x (3/1) x 57 = (25/3) x 57 = $475 Billion
Answer: Option C
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- GMATGuruNY
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An alternate approach is to convert the percentages to RATIOS.At the end of year X, automobile installment credit accounted for 36% of all outstanding consumer installment credit. At that time automobile finance companies extended $57 billion of credit, or 1/3 of the automobile installment credit. How many billion dollars of consumer installment credit was outstanding at that time?
A. 62
B. 171
C. 475
D. 513
E. 684
Let A = automobile installment credit, C = all outstanding consumer installment credit, and E = extended credit.
Automobile installment credit accounted for 36% of all outstanding consumer installment credit.
Thus:
A:C = 36:100 = 9:25.
Finance companies extended 1/3 of the automobile installment credit.
In other words, $1 of credit was extended for every $3 of automobile installment credit.
Thus:
E:A = 1:3 = 3:9.
Combining the two ratios, we get:
E:A:C = 3:9:25
E:C = 3:25.
Since the actual value of E = 57, and 3*19 = 57, the multiplier for the ratio above is 19:
E:C = (3*19) : (25*19) = 57:475.
Thus, C = 475.
The correct answer is C.
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- Brent@GMATPrepNow
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This questions illustrates the importance of ALWAYS checking the answer choices BEFORE getting bogged down with time-consuming calculations. For more on this important strategy, you can watch our free video: https://www.gmatprepnow.com/module/gener ... es?id=1111At the end of year X, automobile installment credit accounted for 36% of all outstanding consumer installment credit. At that time automobile finance companies extended $57 billion of credit, or 1/3 of the automobile installment credit. How many billion dollars of consumer installment credit was outstanding at that time?
A. 62
B. 171
C. 475
D. 513
E. 684
IMPORTANT: Notice that the answer choices are reasonably spread apart. This means we may be able to use some ESTIMATION to find the answer quickly.
$57 billion of credit equals 1/3 of the automobile installment credit
So, the automobile installment credit = (3)($57 billion) = $171 billion
Automobile installment credit accounted for 36% of all outstanding consumer installment credit
IMPORTANT ESTIMATION CONCEPTS:
If x is 25% of y, then y = 4x
If x is 33 1/3% of y, then y = 3x
If x is 50% of y, then y = 2x
Since 36% is a little more than 33 1/3% we can conclude the following: if x is 36% of y, then y = a little less than 3x
The question tells us that automobile installment credit (worth $171 billion) accounts 36% of all outstanding consumer installment credit.
In other words, $171 billion is 36% of all outstanding consumer installment credit.
So, all outstanding consumer installment credit = little less than 3($171)
3(171) = 513, so the correct answer is a little less than $513 billion.
Answer choice C is a little less than $513 billion, so it must be the correct answer.
Cheers,
Brent
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total = A
end of X = 0.36 * A
57 = 1/3 * 0.36 * A
57/0.12 = A
5700/12 = A
just below 500
So, {C}
end of X = 0.36 * A
57 = 1/3 * 0.36 * A
57/0.12 = A
5700/12 = A
just below 500
So, {C}
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