Author note — to cover

Cover simple interest, named in R9's financial mathematics: the same interest on the principal every year, total interest and final balance after n years, and finding the rate, time or principal from a stated total. Contrast with compounding stays brief here; simple-versus-compound-interest and Growth and decay own it. Both tiers. (R9)

Introduction

—coming soon—

Practice and continue

Practice

Simple interest

Interest paid on the starting amount only, so the same sum is added every year.

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Repeated percentage change

Applying the same change repeatedly by raising the multiplier to a power.