Practice · Growth Rate
Growth rate calculations
Growth rate questions appear in nearly every case that involves revenue trends, market expansion, or headcount changes. The math ranges from simple percentage changes to compound annual growth rate estimation.
Why interviewers test this
Growth rates reveal whether a candidate can quickly assess business momentum. 'Revenue grew from €400M to €500M' — the interviewer expects you to say '25% growth' within 3 seconds, not reach for a calculator.
Worked examples
Revenue grew from €400M to €500M. What is the growth rate?
Change: €500M - €400M = €100M. Growth rate: €100M / €400M = 25%. Always divide by the starting number.
A market is €5B today, growing at 10% annually. Approximate size in 3 years?
Year 1: €5.5B. Year 2: €6.05B. Year 3: €6.655B. Round to €6.7B. The Rule of 72: at 10% growth, the market doubles in ~7 years.
Strategies
Growth rate = (New - Old) / Old × 100. Always divide by the OLD number, not the new one.
For compound growth over 2-3 years, just multiply step by step. Don't try to use formulas.
Rule of 72: years to double ≈ 72 / growth rate. At 8% growth, doubling takes ~9 years.
Negative growth: 'Revenue fell from €500M to €400M' = -20%, not -25%. The base is €500M.
Difficulty 1-3. Easy: simple percentage change. Hard: multi-year compound growth with estimation.
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