This document provides a lesson on calculating percentages of increase, decrease, markup, and discount using various word problems as examples. It begins by defining percent of change as the amount of change divided by the original amount. Several practice problems are worked through calculating the percent of increase from original to new amounts, and percent of decrease. Markup is then defined as the percent increase from a store's cost to the sales price, while discount is the percent decrease from the original sales price. More word problems demonstrate calculating markup and discount amounts and new prices. The document concludes by introducing a group activity applying these percentage concepts to advertising a product.

1. 7th Grade Markup and Discount Lesson

11. Markup and Discount is percent of increase and percent of decrease