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What this book is
The arithmetic behind ordinary money, shown slowly. Why the bigger pack can be the dearer one. Where a payslip goes. Why a pay rise can never cost you money through a tax band. How compound interest works for you in savings and against you in debt. Why the longer loan is the bigger bill, what a “flat” rate hides, and why a card’s minimum payment barely moves the balance.
It is arithmetic, not advice. It never tells you what to buy, where to save or whom to borrow from. Every example uses invented round numbers, so the method is easy to see and works wherever you live.
Every chapter, and its free calculator
The calculators are free, need no sign-up, and keep what you type in your own browser. They save arithmetic. The book is complete without them.
Part One · The Price of Things
Calculators: Unit Price
Calculators: Discount · Percentages
Calculators: Multi-Buy · Cost Per Use · Break-Even
Part Two · The Money Coming In
Calculators: Gross to Net · Were You Paid Right?
Calculators: Tax Bands
Calculators: Hourly and Salary · Real Hourly Wage
Part Three · The Money Going Out
Calculators: Bill Rebuilder · Tariff Comparison · Estimated vs Actual
Calculators: True Annual Cost · Subscription Audit · Irregular Costs
Part Four · Money Through Time
Calculators: Compound Interest
Calculators: Rule of 72
Calculators: Cost of Waiting · Savings Goal
Calculators: Real Return · Fee Drag · APY
Part Five · Money You Owe
Calculators: Loan Calculator
Calculators: Car Finance
Calculators: Flat Rate to APR
Calculators: Debt Payoff
Part Six · The Whole Picture
Calculators: Budget Builder · Savings Rate · Debt Share · Variable Income