• NEW! FREE Beat The GMAT Quizzes
    NEW! FREE Beat The GMAT Quizzes
    NEW! FREE Beat The GMAT Quizzes
    Hundreds of Questions Highly Detailed Reporting Expert Explanations TAKE A FREE GMAT QUIZ
  • 7 CATs FREE!
    If you earn 100 Forum Points

    Engage in the Beat The GMAT forums to earn
    100 points for $49 worth of Veritas practice GMATs FREE

    Veritas Prep
    VERITAS PRACTICE GMAT EXAMS
    Earn 10 Points Per Post
    Earn 10 Points Per Thanks
    Earn 10 Points Per Upvote
    REDEEM NOW

The wages earned by Robin is 30% more than...

This topic has 4 expert replies and 0 member replies

The wages earned by Robin is 30% more than...

Post
The wages earned by Robin is 30% more than that earned by Erica. The wages earned by Charles is 60% more than that earned by Erica. How much percent is the wages earned by Charles more than that earned by Robin?

A. 18.75%
B. 23%
C. 30%
D. 50%
E. 100%

The OA is B.

I need help with this PS question. Can any expert explain it please? Thanks.

  • +1 Upvote Post
  • Quote
  • Flag

GMAT/MBA Expert

Legendary Member
Joined
14 Jan 2015
Posted:
2667 messages
Followed by:
122 members
Upvotes:
1153
GMAT Score:
770
Post
LUANDATO wrote:
The wages earned by Robin is 30% more than that earned by Erica. The wages earned by Charles is 60% more than that earned by Erica. How much percent is the wages earned by Charles more than that earned by Robin?

A. 18.75%
B. 23%
C. 30%
D. 50%
E. 100%

The OA is B.

I need help with this PS question. Can any expert explain it please? Thanks.
Let's say Erica earned $100.
If Robin earned 30% more than Erica, then Robin earned 130.
If Charles earned 60% more than Erica, then Charles earned 160

Effectively, we want to know the percent increase from 130 to 160; plug and chug into our trusty %-change formula: (New-Old)/Old * 100, and we get: (160-130)/130 * 100 = (30/130) * 100 =( 3/13) * 100. If 3/12 = 25%, then 3/13 will be a tad lower. The answer is B

_________________
Veritas Prep | GMAT Instructor

Veritas Prep Reviews
Save $100 off any live Veritas Prep GMAT Course

  • +1 Upvote Post
  • Quote
  • Flag
Enroll in a Veritas Prep GMAT class completely for FREE. Wondering if a GMAT course is right for you? Attend the first class session of an actual GMAT course, either in-person or live online, and see for yourself why so many students choose to work with Veritas Prep. Find a class now!
Post
LUANDATO wrote:
The wages earned by Robin is 30% more than that earned by Erica. The wages earned by Charles is 60% more than that earned by Erica. How much percent is the wages earned by Charles more than that earned by Robin?

A. 18.75%
B. 23%
C. 30%
D. 50%
E. 100%

The OA is B.

I need help with this PS question. Can any expert explain it please? Thanks.
What is the source of this question? The wording is TERRIBLE!
- "The wages... is..." --> not grammatically correct
- "30% more" is not the GMAT-preferred idiom. "30% greater" is.
- "How much percent... more" is borderline nonsensical.

Furthermore, the actual answer to this question is not 23%. It's 23.076923....%
On a real GMAT problem, if the answer were approximate, the problem would use the word "approximately."

Studying from non-GMAT-like sources is a really bad idea. The content of this particular question is similar to what you'd see on the real test (though very easy). However, if whoever wrote this question knows this little about grammar and coherent meaning, I would really not trust this source to study from.

This is why it's important to ALWAYS POST YOUR SOURCES!

_________________


Ceilidh Erickson
Manhattan Prep GMAT & GRE instructor
EdM in Mind, Brain, and Education
Harvard Graduate School of Education


Manhattan Prep instructors all have 99th+ percentile scores and expert teaching experience.
Sign up for a FREE TRIAL, and learn why we have the highest ratings in the GMAT industry!

  • +1 Upvote Post
  • Quote
  • Flag
Free Manhattan Prep online events - The first class of every online Manhattan Prep course is free. Classes start every week.

GMAT/MBA Expert

Post
Quote:
The wages earned by Robin is 30% more than that earned by Erica. The wages earned by Charles is 60% more than that earned by Erica. How much percent is the wages earned by Charles more than that earned by Robin?

A. 18.75%
B. 23%
C. 30%
D. 50%
E. 100%

The OA is B.

I need help with this PS question. Can any expert explain it please? Thanks.
Hi LUANDATO,
Let's take a look at your question.

The question states:
The wages earned by Robin is 30% more than that earned by Erica.
Let Erica's earning = x
Then Robin's earning = x + (30%)x = x + (30/100) x = x +0.3 x = 1.3 x

Next the question states:
The wages earned by Charles is 60% more than that earned by Erica.
Charles earning = x + (60%)x = x + (60/100)x = x + 0.6x = 1.6x

We are asked to find the percent change of how much Charle's earning more than Robin's earning.
Percent Change = [(Charles Earning - Robin's Earning) / Robin's Earning] * 100%
Percent Change = [(1.6x - 1.3x) / 1.3x ] * 100%
Percent Change = [ 0.3x / 1.3x ] * 100%
Percent Change = (3/13) * 100%
Percent Change = (300 / 13) %
Percent Change = 23% approximately

Therefore, Option B is correct.

Hope it helps.
I am available if you'd like any follow up.

_________________
GMAT Prep From The Economist
We offer 70+ point score improvement money back guarantee.
Our average student improves 98 points.

  • +1 Upvote Post
  • Quote
  • Flag
Free 7-Day Test Prep with Economist GMAT Tutor - Receive free access to the top-rated GMAT prep course including a 1-on-1 strategy session, 2 full-length tests, and 5 ask-a-tutor messages. Get started now.

GMAT/MBA Expert

Post
LUANDATO wrote:
The wages earned by Robin is 30% more than that earned by Erica. The wages earned by Charles is 60% more than that earned by Erica. How much percent is the wages earned by Charles more than that earned by Robin?

A. 18.75%
B. 23%
C. 30%
D. 50%
E. 100%
We can let Erica’s wage = E, so Robin earns 1.3E and Charles earns 1.6E.

Now we can determine what percentage greater Charles's wages are than Robin’s.

(1.6E - 1.3E)/1.3E x 100 = 0.3E/1.3E x 100 = 3/13 x 100 ≈ 23%.

Alternate Solution:

Let’s assume that Erica earns 100 dollars. This means that Robin earns 130 dollars and Charles earns 160 dollars. We use the percent difference formula:

(Charles $ - Robin $)/Robin $ x 100:

(160 - 130)/130 x 100 = 30/130 x 100 = 3/13 x 100 ≈ 23%.

Answer: B

_________________

Jeffrey Miller
Head of GMAT Instruction
jeff@targettestprep.com



See why Target Test Prep is rated 5 out of 5 stars on BEAT the GMAT. Read our reviews

  • +1 Upvote Post
  • Quote
  • Flag
  • e-gmat Exclusive Offer
    Get 300+ Practice Questions
    25 Video lessons and 6 Webinars for FREE

    Available with Beat the GMAT members only code

    MORE DETAILS
    e-gmat Exclusive Offer
  • EMPOWERgmat Slider
    1 Hour Free
    BEAT THE GMAT EXCLUSIVE

    Available with Beat the GMAT members only code

    MORE DETAILS
    EMPOWERgmat Slider
  • Varsity Tutors
    Award-winning private GMAT tutoring
    Register now and save up to $200

    Available with Beat the GMAT members only code

    MORE DETAILS
    Varsity Tutors
  • The Princeton Review
    FREE GMAT Exam
    Know how you'd score today for $0

    Available with Beat the GMAT members only code

    MORE DETAILS
    The Princeton Review
  • Veritas Prep
    Free Veritas GMAT Class
    Experience Lesson 1 Live Free

    Available with Beat the GMAT members only code

    MORE DETAILS
    Veritas Prep
  • Target Test Prep
    5-Day Free Trial
    5-day free, full-access trial TTP Quant

    Available with Beat the GMAT members only code

    MORE DETAILS
    Target Test Prep
  • Economist Test Prep
    Free Trial & Practice Exam
    BEAT THE GMAT EXCLUSIVE

    Available with Beat the GMAT members only code

    MORE DETAILS
    Economist Test Prep
  • Kaplan Test Prep
    Free Practice Test & Review
    How would you score if you took the GMAT

    Available with Beat the GMAT members only code

    MORE DETAILS
    Kaplan Test Prep
  • PrepScholar GMAT
    5 Day FREE Trial
    Study Smarter, Not Harder

    Available with Beat the GMAT members only code

    MORE DETAILS
    PrepScholar GMAT
  • Magoosh
    Magoosh
    Study with Magoosh GMAT prep

    Available with Beat the GMAT members only code

    MORE DETAILS
    Magoosh

Top First Responders*

1 Ian Stewart 50 first replies
2 Brent@GMATPrepNow 37 first replies
3 Jay@ManhattanReview 33 first replies
4 GMATGuruNY 29 first replies
5 ceilidh.erickson 14 first replies
* Only counts replies to topics started in last 30 days
See More Top Beat The GMAT Members

Most Active Experts

1 image description Scott@TargetTestPrep

Target Test Prep

209 posts
2 image description Max@Math Revolution

Math Revolution

92 posts
3 image description Brent@GMATPrepNow

GMAT Prep Now Teacher

79 posts
4 image description Ian Stewart

GMATiX Teacher

57 posts
5 image description GMATGuruNY

The Princeton Review Teacher

49 posts
See More Top Beat The GMAT Experts