margin of safety

RST Company produces a product that has a variable cost of $6 per unit. The company's fixed costs are $30,000. The product sells for $10 per unit. RST desires to earn a profit of $20,000. The sales level in units to achieve the desire profit is A company that sells multiple types of products has a selling price per composite unit of $150, variable cost per composite unit of $50 and total fixed costs of $25,000. The contribution margin per composite unit is