Two items are missing in each of the following columns and are identified by a letter.
Instructions
Assuming the company uses a perpetual inventory system, calculate the missing amounts and identify them by letter. 
Definitions:
Net Present Value
A method used in capital budgeting to assess the profitability of an investment or project, by calculating the difference between the present value of cash inflows and outflows over a period of time.
Salvage Value
The predicted price that an asset will fetch when it is sold at the conclusion of its usable life.
Working Capital
The difference between a company's current assets and current liabilities, representing the liquidity available to run its operations.
Contribution Margin
The amount by which the sale of a product or service exceeds its variable costs, used to cover fixed costs and generate profit.
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