1. Compute Griffin's Steel Parts' monthly breakeven sales in dollars. 2. Use the contribution margin ratio to project operating income (or loss) if revenues are $540,000 and if they are $1,050,000. 3. Do the results in Requirement 2 make sense given the breakeven sales you computed in Requirement 1? Explain. Griffin's Steel Parts produces parts for the automobile industry. The company has monthly fixed expenses of $670,000 and a contribution margin of 80% of revenues. Read the requirements. Requirement 1. Compute Griffin's Steel Parts' monthly breakeven sales in dollars. Begin by identifying the formula. Breakeven sales in dollars Contribution margin per unit Contribution margin ratio Fixed expenses Operating income Units sold Variable expenses