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	$ 100,000
Variable expenses	65,000
Contribution margin	35,000
Fixed expenses	30,100
Net operating income	$ 4,900

If sales increase to 1,001 units, what would be the increase in net operating income?