Please show formulas and workings

Question 4 Hitch Company uses standard costing system to record costs and has provided you with the following information. Standard cost card Quantity |Standard cost Total standard cost Material 25 kg 65 per kg C125.00 Labour 3 hours $4 per hour $12.00 Actual Costs for 10,000 units: . Material - 30,000 kg 250,000 . Labour - 20,000 hours $45,000 Required: "Calculate the following variances: 1. Material price variance 2. Material usage variance 3. Total material cost variance 4. Labour rate variance 5. Labour efficiency variance (12 marks) (K) Critically evaluate standard costing as a method of cost control. (13 marks)