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

6a. If the selling price increases by $2 per unit and the sales volume decreases by 100 units, what would be the net operating income?

6b. If the variable cost per unit increases by $1, spending on advertising increases by $1,900, and unit sales increase by 280 units, what would be the net operating income?

6c. What is the break-even point in unit sales?

6d. What is the break-even point in dollar sales?