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If money is invested at r percent interest, compounded annua

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If money is invested at r percent interest, compounded annua [#permalink] New post 17 Dec 2012, 05:46
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If money is invested at r percent interest, compounded annually, the amount of the investment will double in approximately 70/r years. If Pat's parents invested $5,000 in a long-term bond that pays 8 percent interest, compounded annually, what will be the approximate total amount of the investment 18 years later, when Pat is ready for college?

(A) $20000
(B) $15000
(C) $12000
(D) $10000
(E) $9000
[Reveal] Spoiler: OA
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Re: If money is invested at r percent interest, compounded annua [#permalink] New post 17 Dec 2012, 05:48
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Walkabout wrote:
If money is invested at r percent interest, compounded annually, the amount of the investment will double in approximately 70/r years. If Pat's parents invested $5,000 in a long-term bond that pays 8 percent interest, compounded annually, what will be the approximate total amount of the investment 18 years later, when Pat is ready for college?

(A) $20000
(B) $15000
(C) $12000
(D) $10000
(E) $9000


Since investment doubles in 70/r years, then for r=8 it'll double in 70/8=~9 years (we are not asked about the exact amount so such an approximation will do). Thus in 18 years investment will double twice and become ($5,000*2)*2=$20,000 (after 9 years investment will become $5,000*2=$10,000 and in another 9 years it'll become $10,000*2=$20,000).

Answer: A.
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Re: If money is invested at r percent interest, compounded annua [#permalink] New post 25 Jun 2014, 11:12
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Re: If money is invested at r percent interest, compounded annua [#permalink] New post 25 Jun 2014, 22:37
It's very important to pay attention to the wordings as first I thought that the compound interest formula needs to be applied.

Though I read the question again and got it correct :)

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Re: If money is invested at r percent interest, compounded annua [#permalink] New post 24 Aug 2014, 14:25
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I think without the 1st sentence, we still can guess the answer easily.

$5,000 at 8%/year = $400/year --> 10-years interest will be $4,000, 20 years will be $8,000
Since the interest compounded annually in 18 years (very long period), the total value would be >$18,000 --> eliminate B,C,D,E
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Re: If money is invested at r percent interest, compounded annua [#permalink] New post 10 Oct 2014, 19:42
should be so easy for business students...especially finance
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Re: If money is invested at r percent interest, compounded annua [#permalink] New post 21 Oct 2014, 23:35
5000 will multiply approx. 4 times = 5000 * 4 = 20000

Answer = A
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Re: If money is invested at r percent interest, compounded annua [#permalink] New post 22 Dec 2015, 10:12
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Re: If money is invested at r percent interest, compounded annua [#permalink] New post 25 Dec 2015, 11:07
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Hi All,

This question has some similarities to "symbolism" questions (in which the prompt shows you a "made up" symbol, tells you what it means and asks you to do a simple calculation with it). The easiest way to tackle the question is to simply follow the instructions.

We're told that r = percent interest.

We're also told that an investment with DOUBLE in approximately 70/r years.

We're told to invest $5,000 at 8 percent for 18 years.

Plug in r = 8

70/8 is about 9 years, meaning our investment will DOUBLE in 9 years.

In the first 9 years, $5,000 doubles to $10,0000
In the next 9 years, $10,000 doubles to $20,000

Final Answer:
[Reveal] Spoiler:
A


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Re: If money is invested at r percent interest, compounded annua   [#permalink] 25 Dec 2015, 11:07
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