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# A certain sum was invested in a high-interest bond for which

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Joined: 07 Jul 2004
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A certain sum was invested in a high-interest bond for which [#permalink]  25 Mar 2005, 01:28
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A certain sum was invested in a high-interest bond for which the interest is compounded monthly. The bond was sold x number of months later, where x is an integer. If the value of the original investment doubled during this period, what was the approximate amount of the original investment in dollars?

1) The interest rate during the period of investment was greater than 39 percent but less than 45 percent.

2) If the period of investment had been one month longer, the final sale value of the bond would have been approximately $2,744. Director Joined: 13 Nov 2003 Posts: 790 Location: BULGARIA Followers: 1 Kudos [?]: 30 [0], given: 0 [#permalink] 25 Mar 2005, 02:39 On a first look think that it is B) GMAT Club Legend Joined: 07 Jul 2004 Posts: 5068 Location: Singapore Followers: 23 Kudos [?]: 194 [0], given: 0 [#permalink] 25 Mar 2005, 09:47 no other takers ? Senior Manager Joined: 15 Mar 2005 Posts: 419 Location: Phoenix Followers: 2 Kudos [?]: 12 [0], given: 0 Re: Investment and Interest (DS) [#permalink] 25 Mar 2005, 11:25 I'd go with C (both combined suffice). 1) Gives us the rate of interest. Knowing x is an integer, and the value doubles, and rate of return is between 39 and 45, its easy to figure out that x = 2 months, and rate is 41%. But this doesn't tell is the principle or final amount. Insufficient. 2. For one month more the total amount would have been$2744. Since both time and rate and principle is unknown this doesn't lead us anywhere.
For example, at 100% rate of return, the principal would have been 2744/(2^x+1). But since x is not know, nor is the rate we can't do a thing.

Combine them, and you know the rate and the time and the final amount for 3 months. Easy to get the principle.

Hence (C).
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Intern
Joined: 25 Feb 2005
Posts: 42
Followers: 1

Kudos [?]: 3 [0], given: 0

I'll go with 'C'

what is OA?
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5068
Location: Singapore
Followers: 23

Kudos [?]: 194 [0], given: 0

OA is C.
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