9:Thanh Long manufactures product A. The company uses a standard costing system and sets the following standards for direct materials and labor (for a single product): Item Direct material Direct labor Norm 0,5 kg 2 hour Unit price 150.000/kg 25.000/hour Cost 75.000/unit 50.000/unit In a month, Thanh Long produced 10,000 products of A with the material consumption of 6,000kg with the unit price of 145,000 VND/kg. Actual labor is 21,000 hours with unit price of 30,000 VND/hour. Expected output is 10,300 products/month. Required: 9.1 Break down the material variance into different related variances: price variance, usage variance and volume variance. 9.2 Identify favorable and adverse variances. Assuming that Thanh Long determine that all variance (adverse or favorable), whenever the threshold is 2% above the standard cost, must be investigated. Identify which variances that need to be investigated. In your opinion, who may responsible for the material variances? What actions should be taken accordingly