Kristian
I found Chapter 12 Achieve PMP Exam Success: A Concise Guide for the Busy Project Manager, 5th Edition had much of the information on math related to contracts.
I don't believe the PMBOK guide refers to it either. In these situations, I often visit my favourite PMP websites and try to find an explanation that I can best digest and document it in my notes. I sometimes start at Wikipedia (knowing that it may not be 100% accurate) but then follow the references sited. Youtube has been surprisingly full of useful content. There isn't one true source with all the answers.
I noticed that none of the prepcast videos or PMP simulator questions that Point of Total Assumption , Final Price and Actual fee calculations are NOT discussed. Where can I learn about these for the PMP exam?
Training for Project Management Professional (PMP)®, PMI Agile Certified Practitioner (PMI-ACP)®, and Certified Associate in Project Management (CAPM)®