Northem Travel uses the contribution margin income statement internally Northem's first-quarter results follow (Click the icon to view the income statement.) Northem's relevant range is between sales of $110,000 and $720,000 Requirements 1 Prepare contribution margin income statements at sales levels of $160,000 and $620,000. (Hint: Use the contribution margin ratio.) 2. Computa break-even sales in dollars Requirement 1. Prepare the contribution margin income statement at the $160,000 level (Round interim percentages to the nearest whole percent. Enter losses with a minus sign or parentheses) Northem Trevel Contribution Mergin etatement Sales revenue La Verlabe expenses Contion margin Less Flead expens Operating income po