Any professional accountant can help me answer the question

1.
There are three different inventory accounts to account for when dealing with manufacturing activities. They are Raw Materials, Work-in-Process (WIP) and Finished Goods.

RAW MATERIALS
The Raw Materials account is treated in the same way as the retail inventory accounts. The only difference is that cost of goods sold (COGS) is now the Cost of Raw Materials Used (CORMU) and should be debited to the WIP account. The calculation is as follows:
Beginning Inventory
Purchases
Returns and Allowances
Transportation-in
Discounts
Duties/Taxes
Cost of Raw
Materials Available
for Use (CORMAFU)
Cost of Raw Materials
Used (CORMU)
Ending Inventory

Valuation of Ending Inventory: Use one of the four Cost Methods
(Specific Identification, Weighted Average Cost, FIFO or LIFO).

WORK-IN-PROCESS
The Work-in-Process (WIP) account includes all product costs, which fall under one of three categories (Raw Materials, Direct Labor or Factory Overhead). After the ending balance in WIP is calculated, the cost of finished goods manufactured (COFGM) can be calculated as follows:
Beginning Inventory
Processing Costs
• Direct labor
• Factory overhead
(e.g., factory rent, equip. costs, prod’n supplies, indirect labor, etc.)
Cost of Raw Materials
Used (CORMU)
Cost of Work-in-process (COWIP)
Cost of finished goods manufactured (COFGM)
Ending Inventory

VALUING THE ENDING BALANCE IN WIP
• One of the most difficult tasks involved in accounting for manufacturing activities is to value the ending balance in WIP.
• The formula to value the ending balance in WIP is always PRM + pDL + pFOH.
• It is difficult to assign all units a common value since they may be at different stages of completion.
• Instead, managers use an estimate where they break down the partially completed goods into three components:
- Raw materials
- Direct labor
- Factory overhead

FINISHED GOODS
After the COFGM has been transferred to the Finished Goods account, the ending balance in Finished Goods can be calculated as follows:
Beginning Inventory
Cost of Finished
Goods Manufactured
Cost of Goods
Available for Sale
(COGAFS)
Cost of Goods Sold
(COGS)
Ending Inventory
(Weighted-average cost)
Cost of Goods Sold Expense
Cost of Goods Sold

Inventory account of a merchandising company: similar to raw material in manufacturing account, and you can simply state it as Stock.

2. Breakeven analysis
There are four break-even points that have been used in evaluating the profitability of operations.
Shut-Down Point--This is the time at which the revenues are equal to the sum of the production costs, such as material, labor and maintenance. For production times greater than the shutdown point, it is more profitable to shutdown than to operate.
Break-even at Cost--This point is the production time at which revenues are equal to the sum of the production and overhead costs or the total costs. At production times between the shutdown and break-even points, the product will lose money but recover some of the overhead costs. This may occur when business is poor and the foundry operates at a loss with the expectation that business will get better.
Break even at Required Return--This is the production time at which not only are the total costs (production and overhead) recovered, but also a desired level of return is recovered.
Break even at Required Return after Taxes--This is the production time at which the total costs, taxes and required level of return are recovered.

1. Manufacturying company inventory account has raw material, WIP and finished goods