Everyday Math & Text
How to Figure Discounts, Sales Tax and Tips in Your Head
One trick covers most shopping math: find 10% first. Here's how to price discounts, add sales tax and pick a tip in your head, and why stacked discounts mislead.
Everyday Math & Text
One trick covers most shopping math: find 10% first. Here's how to price discounts, add sales tax and pick a tip in your head, and why stacked discounts mislead.