How to Add Sales Tax
Add the correct sales tax to a price or invoice, handle taxable and exempt lines, reverse tax-inclusive totals, and configure reliable calculations.
How to Calculate the List Price of an Item on Sale
Calculate an item’s original list price from the sale price and discount rate, with formulas, examples, tax notes, and common mistakes.
How to Calculate Cost Savings Percentage
Calculate cost savings percentage correctly, choose a valid baseline, separate one-time and recurring savings, and avoid misleading results.
How to Calculate Maximum Revenue
Calculate maximum revenue from a price-demand relationship using a revenue function, quadratic vertex, derivative, domain checks, and practical business constraints.