⭐ Important points (exam-critical)
- ⭐Annuity due = ordinary annuity × (1 + i).
- ⭐Perpetuity PV = A / i (no time limit).
- ⭐Doubling: by Rule of 72 → years ≈ 72/r (only for CI).
- ⭐Use log tables when n is large in CI — ICAI calculators not allowed.
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