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Do you know how to identify when to use compound interest in a test question? In this lesson, Professor Eder solves a brand new question from the Instituto Legalle exam board (2026) and shows how to avoid one of the most common pitfalls in Financial Mathematics. You will learn: ✅ How to identify compound interest in the problem statement. ✅ How to correctly calculate successive adjustments. ✅ The difference between simple and compound interest. ✅ The reason why many candidates get this question wrong. ✅ How to quickly recognize this type of problem in public service exams. 📚 Also watch the complete Financial Mathematics playlist (link in the description and in the card during the video). 👍 Leave your LIKE to support the channel! ❤️ Subscribe and become part of the Jucálculos family! 🔔 Activate the bell so you don't miss any lessons, problem solutions, or math tips! 📺 Watch more videos on the channel and help increase our watch time. 📲 Share this video with friends who are studying for competitive exams, college entrance exams, and school tests. 👉Also watch: ✅Videos about FINANCIAL MATHEMATICS:    • MATEMÁTICA FINANCEIRA   ✅ Playlist of All Videos:    • MATEMÁTICA PARA CONCURSOS   ✅ Videos about MATHEMATICS FOR COMPETITIVE EXAMS:    • MATEMÁTICA PARA CONCURSOS