Kim Johnson's company produces two well-known products: Glide Magic and Slide Magic. Glide Magic accounts for 60 percent of her sales, and Slide Magic accounts for the rest. Glide currently sells for $16 per tube and has variable manufacturing and selling costs of $8. Slide sells for just $12 and has variable cost of $9 per tube. Kim's company has total fixed costs of $36,000.

Calculate the total number of tubes (the combined number of both Glide Magic and Slide Magic tubes) that must be sold for Kim's company to break even.

Based on the information given, you calculate the break-even volume to be _____ tubes.