9 free video lectures on Percentages, Profit & Loss for CAT Quant (Arithmetics), taught step by step by Shweta Arora. Free to watch, no signup.
Percentages, Profit & Loss sits in the Arithmetics area of the CAT Quant syllabus. Work through the lectures first, then move to the practice set — the concepts stick far better once you have attempted questions under a timer.