Oslo Company prepared the following contributing 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 6,000 2,000 Required: a) What is the contribution margin ratio? b) If sales increase to 1,001 units, what would be the increase in the net operating income? c} What is the break even point in unit sales? cl) What is the break even point in dollar sales? e) How many units must be sold to achieve a target prot of $5,000