This Instructional Activity is a part of the Lesson 16, Unit 4, Grade 7. Students write and use algebraic expressions and equations to solve percent word problems related to populations of people and compilations. In this module, students have continued to deepen their understanding of ratios and proportional relationships by solving a variety of multi-step percent problems using algebraic equations, expressions, and visual models. The concept relating 100% as a whole is a foundation that students applied in problems including percent increase and decrease, percent error, markups, markdowns, commission, and scale drawings.