4... A firm had $745,000 in fixed costs, a unit selling price of $10, and variable costs of $7. The number of sales, in units, necessary to earn a target profit of $155,000 is ..........................................................

5... If Baxter Co. has an operating leverage of 5 and sales increase from $400,000 to $440,000, the percentage increase expected in operating profit is ....................................................................................

6... If sales are $700,000, the unit selling price is $25, and sales at the break-even point are $400,000, the margin of safety is .....................