Oslo Company prepared the following contribution format income statement

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 400Variable expenses13 800Contribution margin11 600Fixed expenses7 772Net operating income$3 828Required:If sales increase to 1 001 units what would be the increase in net operating income?