The document defines key business math terms:
1) Inventory includes a company's raw materials, finished goods, and goods in production that have not been sold.
2) Depreciation allocates the cost of tangible assets over their useful life for tax and accounting purposes.
3) Principal is the amount borrowed or still owed on a loan, separate from interest.
4) Interest is the fee charged by a lender for the use of borrowed money, usually expressed as an annual percentage of the principal.