Can someone please clarify when to use the PC formula (PC=CV/OV) vs. the NP formula (NP=NV/OV). I'm having trouble identifying when to use each in PS questions. Some examples would be fantastic. Thanks in advance.
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Percent Change vs. New Percent
Source: Beat The GMAT — Quantitative Reasoning |
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Jim@StratusPrep
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By new percent, do you mean 'percent of'?
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Jim@StratusPrep
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Here is a start:
OG 13:
PS:
8
21
58
94
177
181
DS:
151
OG 13:
PS:
8
21
58
94
177
181
DS:
151
GMAT Answers provides a world class adaptive learning platform.
-- Push button course navigation to simplify planning
-- Daily assignments to fit your exam timeline
-- Organized review that is tailored based on your abiility
-- 1,000s of unique GMAT questions
-- 100s of handwritten 'digital flip books' for OG questions
-- 100% Free Trial and less than $20 per month after.
-- Free GMAT Quantitative Review
-- Push button course navigation to simplify planning
-- Daily assignments to fit your exam timeline
-- Organized review that is tailored based on your abiility
-- 1,000s of unique GMAT questions
-- 100s of handwritten 'digital flip books' for OG questions
-- 100% Free Trial and less than $20 per month after.
-- Free GMAT Quantitative Review
The best strategy is to stop thinking in terms of formulas, and think in terms of concepts instead!
Percent change - this will be asking you about the difference between an old situation and a new situation. Look for language of "percent increase," "percent decrease," or "percent change." This will indicate that you're comparing the change to the original:
percent change = (new - original)/original, or difference/original
#57. Company P had 15 percent more employees...
#71. ... the number of stocks... was 20 percent greater...
#94. ... what was the percent increase?
#114. ... what was the percent change?
#115. ... by approximately what percent did the ratio decrease?
#177. ... by what percent did the ratio of price per share increase?
#182. ... what was the approximate profit or loss...
Percent of - this will ask you to simply compare the new value to the original value, but not to calculate the difference. You basically just want to look for language of "percent of."
Percent of = new/original
#21. 150 is what percent of 30?
#58. ... what percent of the original...
# 123. ... what percent of Juan's income is Mary's?
#171. ... the remaining solution will be what percent sodium...
Percent change - this will be asking you about the difference between an old situation and a new situation. Look for language of "percent increase," "percent decrease," or "percent change." This will indicate that you're comparing the change to the original:
percent change = (new - original)/original, or difference/original
#57. Company P had 15 percent more employees...
#71. ... the number of stocks... was 20 percent greater...
#94. ... what was the percent increase?
#114. ... what was the percent change?
#115. ... by approximately what percent did the ratio decrease?
#177. ... by what percent did the ratio of price per share increase?
#182. ... what was the approximate profit or loss...
Percent of - this will ask you to simply compare the new value to the original value, but not to calculate the difference. You basically just want to look for language of "percent of."
Percent of = new/original
#21. 150 is what percent of 30?
#58. ... what percent of the original...
# 123. ... what percent of Juan's income is Mary's?
#171. ... the remaining solution will be what percent sodium...
Ceilidh Erickson
EdM in Mind, Brain, and Education
Harvard Graduate School of Education
EdM in Mind, Brain, and Education
Harvard Graduate School of Education
