The Sasita Corporation manufactures two types of vacuum cleaners, the Zenith for commercial building use and the House-Helper for residences. Budgeted and actual operating data for the year 2019 were as follows: Prior to the beginning of the year, a consulting firm estimated the total volume for vacuum cleaners of the Zenith and House-Helper category to be 250,000 units, but actual industry volume was 256,000 units. What is the total sales-mix variance in terms of the contribution margin? Question 4 options: $200,000 U $900,000 F $400,000 U $1,260,000 F $360,000 U