b. $307,000
Explanation:
Costs to be accounted in cost reconciliation report = Opening balance of work in process + Cost of production added during the month
= $24,000 + $283,000
= $307,000
Cost reconciliation report shows what costs need to be accounted for in a month and the manner in which they are actually accounted for.
It is a step in preparation of production report which shows how beginning work in process inventory and the costs which are added to production during the period are recorded.
Hence in cost reconciliation report pertaining to the month of Aug, opening work in process and costs added to production during the month are recorded.