Songsu's small business can produce up to 1,000 units. He looks at his profit information from the past year and notes the following: sales of $6,750, variable cost per unit of $5, fixed costs of $1,900, and operating income of $1,100. What was Songsu's sales volume last year? Sales volume units What is the company's relevant range? Relevant range to units Determine the margin of safety in both units and sales dollars, Margin of 5 afety in units. units Margin of safety in dollars 5