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A sum of money doubles itself at compound interest in 15 years. In how many years it will become eight times?

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A sum of money doubles itself at compound interest in 15 years. In how many years it will become eight times? Answer: 45

Question context

This question is part of 📏 Arithmetic Aptitude within the broader 🧠 Aptitude Mastery subject and appears in the ETEA Educational Testing and Evaluation Agency preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.