Money

Compound growth with contributions, a year-by-year table, and a simple chart.

What a sum buys later, and what today’s basket costs later, at a rate you choose.

The fixed installment on a fully amortizing loan, plus a basic repayment table.

Selling price, margin, and markup, kept as different percents.

Spitzer annuity or equal principal, with every monthly row.

Annual pay from an hourly rate, before any tax.

Add tax to a net price, or pull it back out of a gross price.