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 $ 23,900 Variable expenses Contribution margin 13,300 10,600 Fixed expenses 7,632 Net operating income $ 2,968 Required: If the variable cost per unit increased by $1.30, spending on advertising increased by $1,800, and unit sales increased by 250 units, what would be the net operating income? (Do not round intermediate calculations.) Net operating income -