The arithmetic behind everyday money decisions: percent change, compounding, loans and credit cards, inflation, fees, tax brackets, take-home pay, exchange rates, depreciation, total cost of ownership, expected value, unit pricing and emergency funds. Complements the actuarial chapter, which derives the same interest theory symbolically for exam work.
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Every idea is taught with motivation and a worked example before the drills, and an FSRS spaced-repetition engine schedules each review for the day its model predicts you would forget it. A short placement check finds what you already know, so you start Personal Financial Mathematics exactly where it's useful.