Percent Discount & Markup Activity | The Vanishing MarkdownTurn percent of a number, discounts, markups, percent change, and two-step percent problems into a high-interest math investigation.In this Detective Math case, students investigate a storewide markdown report that does not match the recorded sale prices. A store claimed a “40% off” report, but some prices do not match the percent math. Students verify discounts, audit suspect entries, follow two-step percent trails, compare claimed vs.