a) A business may choose Variable Costing out of several systems for unit cost determination. Explain the concept of this system in detail. Discuss the similarities and differences between Variable Costing and Absorption Costing. How are the manufacturing and non- manufacturing costs presented under Variable Costing? (3 Marks) b) ABC analysis is an extremely important technique of materials control among others. Explain its concept in detail. Discuss, in detail, the merits and demerits of using this technique. Can it be used by all kinds of business? If so, state the required preparation for its implementation. (3 Marks) c) Explain the following with the help of relevant examples: (2 + 1 + 1 Marks) i) Classification of labor cost. ii) Idle time and its causes. Turnover and its causes