In ICSE, the maturity value formula is A = P × n + P × (n(n+1)/2) × (r/1200), ji. That n(n+1)/2 part is because interest is calculated each month on a reducing principal—like a series—so it cleverly sums the months. They taught us this in school, but it felt abstract until now. Now, as I save for my first proper phone, putting in 500 rupees each month, I see how those early months earn more interest—it's not just a formula, it's my patience adding up, hai na?
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