Solution:
Calculation of Closing Stock: 1st January, 20XX: Opening balance: 50 units @ Rs 4 = 50 × 4 = Rs. 200 Issue: 2nd January, 20XX: 30 units = 30 × 4 = Rs. 120 Remaining Stock = (50 - 30) × 4 = Rs. 80 Reciept: 5th January, 20XX: 100 units @ Rs 5 = 100 × 5 = Rs. 500 Reciept: 12th January, 20XX: 200 units @ Rs 4.50 = 200 × 4.5 = Rs. 900 Remaining Stock = Rs. 80 + Rs. 500 + Rs. 900 = Rs. 1480 Issue: 18th January, 20XX: 150 units = (150 × 4.5) = Rs. 675 Remaining Stock = (50 × 4.5) + (100 × 5) + (20 × 4) = Rs. 805.

Solution:
Higher level of production leads to higher repair cost.

Solution:
Material control involves purchase, storage and issue of material. Materials control is the systematic control over the materials at all its stages procurement, storage and usage so as to help in maintaining regular and uninterrupted flow of the materials in the production pipeline.

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Solution:
Cost of product failure, error prevention and appraisals can be classified under costs of quality. Cost of quality (COQ) is defined as a methodology that allows an organization to determine the extent to which its resources are used for activities that prevent poor quality, that appraise the quality of the organization's products or services, and that result from internal and external failures.

Solution:
cost object user, who is ranked first in incremental cost allocation method is known as primary user. The term primary user describes someone who interacts with a system. The primary user is in direct contact with the system interface and thus is usually most affected by it.

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