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 costs of $9 per tube. Kim's company has total fixed costs of $36,000.

Required:

Calculate the total number of tubes that must be sold for Kim's company to break even. ______ tubes