This document provides instructions on how to calculate mark-up price and percentage mark-up using cost and selling price. It defines key terms like cost, selling price, peso mark-up. It explains how to calculate peso mark-up by subtracting cost from selling price. And how to calculate percentage mark-up by dividing either peso mark-up by cost or selling price. Worked examples are provided and an assessment with multiple items requires calculating both peso and percentage mark-up using different methods.