Luminous Generating, Inc., produces ion generators and control (detection) devices for industrial applications such as chemical labs. It is contemplating an expansion into the home security market by producing a smoke detector based off of the same technology that would sell at a price of $50. The production of each smoke detector would require $20 in materials, and 0.4 hours of labor at the rate of $25 per hour. Energy, supervisory and other variable overhead costs would amount to $10 per unit. The accounting department has derived an allocated fixed overhead charge of $7.50 per smoke detector (at a projected volume of 300,000 units) to account for the expected increase in fixed costs.

What is Luminous Generating's breakeven sales volume (in units) for smoke detectors? Calculate the degree of operating leverage at a projected volume of 300,000 units and explain what the DOL means.