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 $ $24,500$

Variable expenses $13,500$

Contribution margin $11,000$

Fixed expenses $7,700$

Operating income $ $3,300$

$5.$ If sales decline to $900$ units, what would be the operating income? $($Do not round intermediate calculations.$)$