This is a classic percentage change problem that can trip you up if you're not careful about tracking all the moving parts. Let me walk you through how to think about this systematically.
The Key InsightHere's what you need to see first: when the problem says "adding 2 employees new to the company for every current employee of the department," those new employees increase both the department size AND the total company size. This is crucial - both our numerator and denominator are changing!
Let's Set Up Smart NumbersSince the department currently makes up 22% of the company, let's make our lives easier with concrete numbers:
- Current department employees = 22
- Current total company employees = 100
Notice how this gives us exactly \(\frac{22}{100} = 22\%\) - perfect!
Calculate the ExpansionNow, here's where we need to be careful. The company adds 2 new employees for
every current department employee:
- New employees added = \(2 \times 22 = 44\)
- Department after expansion = \(22 + 44 = 66\) employees
Since these 44 employees are "new to the company," the total company size also increases:
- Company after expansion = \(100 + 44 = 144\) employees
Find the New PercentageAfter the expansion:
\(\frac{66}{144} = 0.458... = 45.8\%\)
Looking at our answer choices, 45.8% is closest to
46%, which is answer choice C.
Think about it - the department roughly tripled (from 22 to 66) while the company grew by less than 50% (from 100 to 144), so it makes sense that the department's percentage would jump significantly from 22% to about 46%.
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Want to master this question type systematically? You can check out the
step-by-step solution on Neuron by e-GMAT to learn the complete framework, alternative approaches, and common variations of percentage change problems. You can also explore other GMAT official questions with detailed solutions on Neuron for structured practice
here.