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# Compound Interest Problems

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Math Expert
Joined: 02 Sep 2009
Posts: 37654
Followers: 7409

Kudos [?]: 99778 [2] , given: 11047

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28 Jul 2014, 14:57
2
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Expert's post
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This post was
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Compound Interest Problems

 ! This post is a part of the Special Questions Directory focusing on Quant topics traditionally neglected and not covered by conventional sources but still tested on the GMAT. Many of these are above average difficulty questions

Compound interest questions are quite often for the test. Many of them involve quite ugly numbers and tedious math, which should be an indication that they can be solved with a shortcut approach or approximation.

PS:

alex-deposited-x-dollars-into-a-new-account-126459.html
peter-invests-100-000-in-an-account-that-pays-167793.html
if-1-000-was-invested-at-an-annual-interest-rate-of-64739.html
on-the-first-of-the-year-james-invested-x-dollars-at-128825.html
10-000-is-deposited-in-a-certain-account-that-pays-r-65464.html
jolene-entered-an-18-month-investment-contract-that-127308.html
louie-takes-out-a-three-month-loan-of-1000-the-lender-101506.html
michelle-deposited-a-certain-sum-of-money-in-a-savings-138273.html
alan-has-split-his-savings-equally-into-two-accounts-the-174445.html
leona-bought-a-1-year-10-000-certificate-of-deposit-that-143742.html
donald-plans-to-invest-x-dollars-in-a-savings-account-that-82702.html
a-sum-of-3310-is-to-be-paid-back-in-3-equal-installments-151366.html
diana-invested-61-293-in-an-account-with-a-fixed-annual-168637.html
on-a-certain-day-tim-invested-1-000-at-10-percent-annual-117437.html
julie-put-half-of-her-savings-in-a-savings-account-that-pays-174262.html
shawn-invested-one-half-of-his-savings-in-a-bond-that-paid-s-37333.html
john-deposited-10-000-to-open-a-new-savings-account-that-135825.html
marcus-deposited-8-000-to-open-a-new-savings-account-that-128395.html
an-amount-is-deposited-into-an-account-accruing-interest-ann-141389.html
a-bank-offers-an-interest-of-5-per-annum-compounded-annua-154203.html
if-money-is-invested-at-r-percent-interest-compounded-annua-144266.html
a-sum-of-money-doubles-itself-at-a-compound-interest-in-15-y-167196.html
if-money-is-invested-at-r-percent-interest-compounded-annual-104225.html
the-difference-between-simple-interest-and-compound-interest-of-a-198898.html

DS:

if-a-loan-of-p-dollars-at-an-interest-rate-of-r-percent-161402.html
on-may-1-of-last-year-jasmin-invested-x-dollars-in-a-new-133937.html
at-the-beginning-of-january-2003-elizabeth-invested-money-in-an-accou-194353.html

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Joined: 06 Mar 2014
Posts: 277
Location: India
GMAT Date: 04-30-2015
Followers: 0

Kudos [?]: 80 [0], given: 84

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19 Sep 2014, 02:36
1
This post was
BOOKMARKED
Bunuel wrote:

Compound Interest Problems

 ! This post is a part of the Special Questions Directory focusing on Quant topics traditionally neglected and not covered by conventional sources but still tested on the GMAT. Many of these are above average difficulty questions

Compound interest questions are quite often for the test. Many of them involve quite ugly numbers and tedious math, which should be an indication that they can be solved with a shortcut approach or approximation.

PS:

alex-deposited-x-dollars-into-a-new-account-126459.html
peter-invests-100-000-in-an-account-that-pays-167793.html
if-1-000-was-invested-at-an-annual-interest-rate-of-64739.html
on-the-first-of-the-year-james-invested-x-dollars-at-128825.html
10-000-is-deposited-in-a-certain-account-that-pays-r-65464.html
jolene-entered-an-18-month-investment-contract-that-127308.html
louie-takes-out-a-three-month-loan-of-1000-the-lender-101506.html
michelle-deposited-a-certain-sum-of-money-in-a-savings-138273.html
alan-has-split-his-savings-equally-into-two-accounts-the-174445.html
leona-bought-a-1-year-10-000-certificate-of-deposit-that-143742.html
donald-plans-to-invest-x-dollars-in-a-savings-account-that-82702.html
a-sum-of-3310-is-to-be-paid-back-in-3-equal-installments-151366.html
diana-invested-61-293-in-an-account-with-a-fixed-annual-168637.html
on-a-certain-day-tim-invested-1-000-at-10-percent-annual-117437.html
julie-put-half-of-her-savings-in-a-savings-account-that-pays-174262.html
shawn-invested-one-half-of-his-savings-in-a-bond-that-paid-s-37333.html
john-deposited-10-000-to-open-a-new-savings-account-that-135825.html
marcus-deposited-8-000-to-open-a-new-savings-account-that-128395.html
an-amount-is-deposited-into-an-account-accruing-interest-ann-141389.html
a-bank-offers-an-interest-of-5-per-annum-compounded-annua-154203.html
if-money-is-invested-at-r-percent-interest-compounded-annua-144266.html
a-sum-of-money-doubles-itself-at-a-compound-interest-in-15-y-167196.html
if-money-is-invested-at-r-percent-interest-compounded-annual-104225.html

DS:

if-a-loan-of-p-dollars-at-an-interest-rate-of-r-percent-161402.html
on-may-1-of-last-year-jasmin-invested-x-dollars-in-a-new-133937.html

Terrific. I guess this should take care of the Interest Problem Issues once and for all.
GMAT Club Legend
Joined: 09 Sep 2013
Posts: 14487
Followers: 609

Kudos [?]: 174 [0], given: 0

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30 Sep 2015, 22:44
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Joined: 21 Jan 2014
Posts: 105
GMAT 1: 500 Q32 V28
GPA: 4
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Kudos [?]: 18 [0], given: 46

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17 Feb 2016, 02:00
Great post!!! :D

Is there someone who knows where I can read some good theory about simple and coumpound interest?
Looking on internet I found something, but it wasn't so exhaustive, in fact I have been able to solve and understand only some questions.

Math Expert
Joined: 02 Sep 2009
Posts: 37654
Followers: 7409

Kudos [?]: 99778 [1] , given: 11047

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17 Feb 2016, 02:32
1
KUDOS
Expert's post
2
This post was
BOOKMARKED
pepo wrote:
Great post!!! :D

Is there someone who knows where I can read some good theory about simple and coumpound interest?
Looking on internet I found something, but it wasn't so exhaustive, in fact I have been able to solve and understand only some questions.

Percentages, Interest and More

Theory on Percent and Interest Problems

DS Percent and Interest Problems
PS Percent and Interest Problems

Hope it helps.
_________________
GMAT Club Legend
Joined: 09 Sep 2013
Posts: 14487
Followers: 609

Kudos [?]: 174 [0], given: 0

### Show Tags

18 Mar 2017, 06:21
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
Re: Compound Interest Problems   [#permalink] 18 Mar 2017, 06:21
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