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 $ 45,000

Variable expenses 31,500

Contribution margin 13,500

Fixed expenses 8,640

Net operating income $ 4,860

4. If sales increase to 1,001 units, what would be the increase in net operating income? (Round your answer to 2 decimal places.)