Page 1 of 1 [ 3 posts ]
 Print view Previous topic | Next topic
Author Message
 Post subject: Math Essentials (Vol. O), Question #20.Posted: Sat Sep 04, 2010 9:18 pm

Joined: Thu Jul 01, 2010 12:05 am
Posts: 35
This question asks: If a stock decreases in value from \$87.50 to \$62.50, what is the percent change?

A) -20%
B) -25%
C) -29%
D) -38%
E) -43%

The correct answer is "C)". I left this one blank because my solution did not match any of the given solutions. I verified my results with the book's answer sheet and I realized that I made a careless mistake subtracting \$87.50 from \$62.50. It should have been "-25", but I had "-15". Beside this error, I am curious as to how the answer sheet converted all the numbers into fractions that we can simplify later on.

For instance, the book converted:
(-\$25/\$87.50) X 100%...into...
[- (2/8 X \$100) / (7/8 X \$100) ] 100% = -29%

My question is how valuable would it be to memorize the values of standard fractions and be able to recognize the values of standard fractions multiplied by a certain quotient (e.g. 2 and 8 in this case). Would this ability come from practice or memorization of the values of standard fractions?

Top

 Post subject: Re: Math Essentials (Vol. O), Question #20.Posted: Sun Sep 05, 2010 6:01 pm

Joined: Thu Feb 12, 2009 6:32 pm
Posts: 497
It is tremendously useful to memorize standard fraction / decimal equivalents!
You should know 1/2, 1/3, 2/3, 1/4, 3/4, 1/5, 2/5, 3/5, 4/5, 1/6, 5/6, 1/7, 1/8, 3/8, 5/8, 7/8, all the ninths, and the tenths.

This will be covered in your first day of class.

Veritas Help

Top

 Post subject: Re: Math Essentials (Vol. O), Question #20.Posted: Mon Sep 06, 2010 3:10 am

Joined: Thu Jul 01, 2010 12:05 am
Posts: 35
It's good to know the decimal equivalents of standard fractions. Thanks for pointing them out.

Matt

Top

 Display posts from previous: All posts1 day7 days2 weeks1 month3 months6 months1 year Sort by AuthorPost timeSubject AscendingDescending
 Page 1 of 1 [ 3 posts ]

 All times are UTC - 8 hours [ DST ]

#### Who is online

Users browsing this forum: No registered users and 2 guests

 You cannot post new topics in this forumYou cannot reply to topics in this forumYou cannot edit your posts in this forumYou cannot delete your posts in this forumYou cannot post attachments in this forum

 Search for: