E4-15A Prepare contribution margin income statements (Learning Objectives 1 \& 2) First Nation Travel uses the contribution margin income statement internally. First Nation's first-quarter results follow. First Nation's relevant range is between sales of $100,000 and $700,000 Requirements 1. Prepare contribution margin income statements at sales levels of $150,000 and $700,000. (Hint: Use the contribution margin ratio.) 2. Compute break-even sales in dollars