Dawn McMillan 
My Store in the Mall [PDF ebook] 

This book explains the basics of percents in the context of business. Follow along as a store owner uses percentages to help organize the layout of the store, maintain inventory, manage sales, create budgets, and price merchandise! With vibrant photos, math charts and diagrams, grade-appropriate text, and informational text features to help navigate the text, students will learn practical, real-world applications of math skills as they learn percents and build their STEM skills.