Forum Home > GMAT > Quantitative > Problem Solving (PS)
Events & Promotions
|
|
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Dec 1608:00 AM PST
-11:59 PM PST
GMAT Club 12 Days of Christmas is a 4th Annual GMAT Club Winter Competition based on solving questions. This is the Winter GMAT competition on GMAT Club with an amazing opportunity to win over $40,000 worth of prizes!
Dec 1511:00 AM IST
-01:00 PM IST
Attend this free GMAT Algebra Webinar and learn how to master the most challenging Inequalities and Absolute Value problems with ease.- Dec 17
09:00 AM PST
-10:00 AM PST
Join Manhattan Prep instructor Whitney Garner for a fun—and thorough—review of logic-based (non-math) problems, with a particular emphasis on Data Sufficiency and Two-Parts. - Dec 18
10:00 AM PST
-11:00 AM PST
Here is the essential guide to securing scholarships as an MBA student! In this video, we explore the various types of scholarships available, including need-based and merit-based options. - Dec 21
11:00 AM IST
-01:00 PM IST
Do RC/MSR passages scare you? e-GMAT is conducting a masterclass to help you learn – Learn effective reading strategies Tackle difficult RC & MSR with confidence Excel in timed test environment
22 Sep 2003, 14:19
Kudos
Bookmarks
N
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
(N/A)
Question Stats:
0% (00:00) correct
0%
(00:00)
wrong
based on 0
sessions
History
Date
Time
Result
Not Attempted Yet
1.To travel trip of 40 miles?the speed for the first Y miles was
X, and the speed for the remaining 40-y is 1.2X. what's the average
speed?
1) x=12 m/h 2) y=20
2.The 'rule of 72', defining the time needed for the investment to
double, is K/2, where K means the percentage interest to be
compounded yearly. If an investment of $10,000 is invested at the
annual rate of 8%. And after the investment yields to be $20,000, and
again be invested at the annual rate of 12%. Then according to the
'rule of 72', how long will it take the original to yield a total of
$40,000?
X, and the speed for the remaining 40-y is 1.2X. what's the average
speed?
1) x=12 m/h 2) y=20
2.The 'rule of 72', defining the time needed for the investment to
double, is K/2, where K means the percentage interest to be
compounded yearly. If an investment of $10,000 is invested at the
annual rate of 8%. And after the investment yields to be $20,000, and
again be invested at the annual rate of 12%. Then according to the
'rule of 72', how long will it take the original to yield a total of
$40,000?
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Problem Solving (PS) Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
16 Jan 2004, 19:17
Kudos
Bookmarks
For Q2, the answer should be 15 years. The question is wrong. Rule of 72 should be '72/interest rate' for an investment to double. You can try it yourself on your calculator. Therefore, at 8%, it will take 72/8 = 9 years for first portion to double. Then 72/12 = 6 years to double again at 12%. Then 9+6 = 15 years.
Quote:
Q2 - is it 4+6 = 10 ?
Besides it doesn't make sense that at 8% interest, it takes only 4 years to double as opposed to 6 years when interest rates are at 12%. 
