4. Explain the concept of direct material cost variance. Calculate and interpret direct material price and quantity variance. Illustrate with an example to be selected from the company based on the first alphabet of your mother's name. (10 Marks) 5. What is Direct labour cost variance? Illustrate with an example to be selected from the company based on the first alphabet of your mother's name. (10 Marks) 6. What is Factory Overhead cost variance? Illustrate with an example to be selected from the company based on the first alphabet of your mother's name. (10 Marks)