Final answer:
Stewart Machine Sales, Inc. must sell 75,000 units of the small carbide drills to break-even, which is calculated using the break-even point formula with given fixed costs and estimated variable costs.
Step-by-step explanation:
To calculate how many units Stewart Machine Sales, Inc. must sell to break-even on their additional line of small carbide drills, we can use the break-even point formula. The break-even point is where total revenue equals total fixed and variable costs. The formula is Break-Even Units (BEU) = Fixed Costs / (Selling Price per Unit - Variable Cost per Unit).
In this case, the fixed costs are $300,000 and they plan to sell the drills at a price of $10 per unit. The variable costs are estimated to be $600,000 for 100,000 units, which means the variable cost per unit is $600,000 / 100,000 units = $6 per unit. Plugging these values into our formula:
BEU = $300,000 / ($10 - $6)
BEU = $300,000 / $4
BEU = 75,000 units
Therefore, Stewart Machine Sales, Inc. needs to sell 75,000 units of the small carbide drills to break-even.