The cost structure of two firms competing in the same industry is represented by the following cost formulas: Company X = $1,816,000 + $42/ unit; Company Z = $956,000 + $82/unit. The selling price is $133 per unit for both companies. Required: Calculate the indifference point between the two cost structures, that is, the amount of unit sales that produce the same operating income for Company X and Company Z. If sales volume were expected to increase by 25% over the next two years, which cost structure would you prefer?