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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	$	25,000
Variable expenses		17,500
Contribution margin		7,500
Fixed expenses		4,200
Net operating income	$	3,300

What is the contribution margin per unit?

What is the contribution margin ratio?

What is the variable expense ratio?

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