The document defines key terms related to markup, cost price, and selling price. It provides a formula to calculate markup (M=Selling Price - Cost Price) and markup percentage (Markup/Cost Price * 100). An example is given where keychains are purchased for ₱10 each and sold for ₱15 each, resulting in a ₱5 markup and 50% markup percentage based on cost. Questions are then provided to test understanding of calculating markup, markup percentage, and using cost price versus selling price in the calculations.