4.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	$	20,000
Variable expenses		12,000
Contribution margin		8,000
Fixed expenses		6,000
Operating income	$	2,000

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

5.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	$	20,000
Variable expenses		12,000
Contribution margin		8,000
Fixed expenses		6,000
Operating income	$	2,000

If sales decline to 900 units, what would be the operating income?