Forest Components makes aircraft parts. The following transactions occurred in July. Purchased $16,870 of materials on account. Issued $16,700 in direct materials to the production department. Issued $1,340 of supplies from the materials inventory. Paid for the materials purchased in transaction (1) using cash. Returned $2,070 of the materials issued to production in (2) to the materials inventory. Direct labor employees earned $32,400, which was paid in cash. Purchased miscellaneous items for the manufacturing plant for $17,310 on account. Recognized depreciation on manufacturing plant of $36,500. Applied manufacturing overhead for the month. Forest uses normal costing. It applies overhead on the basis of direct labor costs using an annual, predetermined rate. At the beginning of the year, management estimated that direct labor costs for the year would be $436,000. Estimated overhead for the year was $388,040. The following balances appeared in the inventory accounts of Forest Components for July. Beginning Ending Materials Inventory ? $ 12,550 Work-in-Process Inventory ? 10,620 Finished Goods Inventory $ 2,700 6,940 Cost of Goods Sold ? 73,800 Required: a. Prepare journal entries to record these transactions. b. Prepare T-accounts to show the flow of costs during the period from Materials Inventory through Cost of Goods Sold.

I am specifically stuck on determining the beginning balance of work-in-progress. If I had that, I would have the rest of the numbers but I can't figure out how to back into it. Please explain the steps so that I can learn. Thank you!