Inc. BarCharts 
Finance Equations & Answers [PDF ebook] 

Students and business owners alike are sure to find that this 3-panel (6-page) guide is an invaluable source of comprehensive, up-to-date information regarding key financial principles and methodologies, as well as the formulas and equations that apply to them. Easy-to-use icons help users go right to the equations and formulas they need to learn, and call out helpful tips to use, common pitfalls to avoid, and critical points to remember.