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• Simple interest: $$A = P(1 + in)$$
• Compound interest: $$A = P(1 + i)^n$$
• Simple depreciation: $$A = P(1 - in)$$
• Compound depreciation: $$A = P(1 - i)^n$$
• Nominal and effective annual interest rates: $$1 + i = \left( 1 + \frac{i^{(m)}}{m} \right)^m$$