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100 points for $49 worth of Veritas practice GMATs FREE VERITAS PRACTICE GMAT EXAMS Earn 10 Points Per Post Earn 10 Points Per Thanks Earn 10 Points Per Upvote ## The wages earned by Robin is 30% more than... tagged by: BTGmoderatorLU ##### This topic has 4 expert replies and 0 member replies ### Top Member ## The wages earned by Robin is 30% more than... 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. ### GMAT/MBA Expert Legendary Member Joined 14 Jan 2015 Posted: 2667 messages Followed by: 122 members Upvotes: 1153 GMAT Score: 770 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

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Save $100 off any live Veritas Prep GMAT Course 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! ### GMAT/MBA Expert GMAT Instructor Joined 04 Dec 2012 Posted: 2094 messages Followed by: 238 members Upvotes: 1443 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! Free Manhattan Prep online events - The first class of every online Manhattan Prep course is free. Classes start every week. ### GMAT/MBA Expert GMAT Instructor Joined 04 Oct 2017 Posted: 551 messages Followed by: 11 members Upvotes: 180 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. 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 GMAT Instructor Joined 09 Apr 2015 Posted: 1465 messages Followed by: 18 members Upvotes: 39 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 Ericaâ€™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 Robinâ€™s. (1.6E - 1.3E)/1.3E x 100 = 0.3E/1.3E x 100 = 3/13 x 100 â‰ˆ 23%. Alternate Solution: Letâ€™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 â‰ˆ 23%.

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