Sales $20,000 Variable expenses 12,000 Contribution margin 8,000 Fixed expenses 6,000 Net operating income $2,000 Required: (don't use commas, dollar signs $ or % in your answers. Always go back to the original information to make the changes listed below) 1. What is the contribution margin per unit?(round answer to nearest whole $) 2. What is the contribution margin ratio? (round to closest whole percentage) 3. What is the variable expense ratio? (round to closest whole percentage) 4. If sales increase to 1,001 units, what would be the increase in net operating income?(round answer to nearest whole $) 5. If the selling price increases by $2 per unit and the sales volume decreases by 100 units, what would be the net operating income (round answer to nearest whole $)? 6. If sales decline to 900 units, what would be the net operating income (round answer to nearest whole $)? 7. If the variable cost per unit increases by $1, spending on advertising increases by $1.500, and unit sales increase by 250 units, what would be the net operating income (round answer to nearest whole $)