The objective of allocating all costs to producer is to?

Use the information below to answer question 28 and 29.
Raw materials inventory at the beginning of a period was N 46,800 and at the close of the period there was a balance of N38,600. From the purchases made during the period, defective materials costing N9,200 were returned. Cost of materials consumed during the period was N448,500.
What was the total purchases made during the period?

What was the cost of materials available for use during the period?

The limitations of the receipts and payments account arise mainly because of the reliance on?

The trading account is to a sole trader what income and expenditure account is to a?