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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 $ $25,700$

Variable expenses $13,900$

Contribution margin $11,800$

Fixed expenses $7,788$

Operating income $ $4,012$

$7.$ If the variable cost per unit increases by $$0\mathrm{.}60,$ spending on advertising increases by $$1,100,$ and unit sales increase by $250$ units, what would be the operating income? $($Do not round intermediate calculations.$)$