Oslo Company prepared the following contribution format income statement based on a sales volume of 1,000 units (the relevant range of production is 500 units to 1,500 units): Sales Variable expenses Contribution margin Fixed expenses Net operating income $ 80,000 52.000 28,000 21,840 $ 6,160 5. If sales decline to 900 units, what would be the net operating Income? Not operating income Sales Variable expenses Contribution margin Fixed expenses Net operating income $ 80,000 52,000 28,000 21,840 $ 6,160 inces 7. If the variable cost per unit increases by $1. spending on advertising increases by $1,700, and unit sales increase by 240 units, what would be the net operating income? Net operating income