how do you get to 10000 U?

Question 17 Regis Corp. uses two materials, X and Y in making its product. The standards are: Material Standard Mix Standard Unit Price Standard Cost 3.500 units $1.00 per unit $3,500 1.500 units $3.00 per unit $4.500 Yield 4.000 units Actual production information for April was: Material Actual Mix 30,000 units 20.000 units Yield 36,000 units What is the materials mix variance? $5,000 F $10,000 u $10,000 F $15.000 F