Math at work · the store, worked out

The Cash Register

Retail and small-business math for store workers, managers and business students, one step at a time: markup and margin, stacked discounts, making change and counting the till, sales tax, time cards, overtime and commission, break-even, profit and loss, inventory and unit prices. Shopping as a customer (a sale price, tax and tip) is on the Hundred Grid; loans, interest and take-home pay on the Money Jar.

For learning and practice. Sales tax rules (what is taxable, how it is rounded) and labor laws (overtime, breaks, how time is rounded) vary by state, city and country, and change. For real payroll, taxes and pricing, check your local rules, your employer’s policy or an accountant.

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The work

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    US dollars throughout; money is kept exact and rounded to the cent at the end.