1.Suppose a retail business sells its commodities at a margin of 25% on all items purchased and sold.Moreover, the company uses a 5% commission as selling expense and Birr 12,000 as a fixed cost.Find the break-even revenue for the retail business after developing the TC equation. Answer: Y = 0.8x + 12,000 and X_e = Birr 60,000. It is interpreted as; when the company receives Birr 60,000 as sales revenues, there will be no loss or no profit.