This essays is about 8712 Most Useful and Common Rules in Mathematical Financial Laws. Uses in Corporate Performance Management (CPM) as a business intelligence (BI) involved with monitoring and assuring an organization's performance, according to key performance indicators (KPIs) as revenue, return on investment (ROI), overhead, and operational costs. "Rocket science" in finance involving activity of information technology to provide detailed output from mathematical modeling to inform finance decisions, by mathematical models implemented in complex IT environments. The nicest thing about it, is that only requires simple Junior Highschool Algebra. We just need to be consistent with its less number treatment of constellations. Its saddest part is that many professors and doctors are no longer able to understand Junior Highschool Algebra, and hiding in Accounting jargons.