Yellowstone Comparty began operations on January 1 to produce a single product. it used an absorption costing system with a planned production volume of 127,000 units. During its first year of operations, the planned production volume was achieved, and there were no fixed seliting or administrative expenses. Inventory on December 31 was 12700 units, and operating income for the year was $342900 Required: 1. If Yellowstone Company had used variable costing, its operating income would have been $304,800. Compute the break-even point in units under variable costing