This assignment solution addresses a problem-solving exercise for ECON 1009, covering key topics in introductory economics and finance. The solution begins with an analysis of perfect competition in the orange market, including market equilibrium, shortages, and surpluses. It then delves into the characteristics of perfectly competitive markets. The assignment further explores the differences between income and expense statements and balance sheets, their relationship, and their significance in understanding an individual's or household's financial position. The solution also includes calculations of taxable income, tax payable, and average tax rates. Finally, it differentiates between debit and credit cards, simple and discount interest rates, explaining their functions and applications.