Perform the indicated operations and simplify the expression. 
Definitions:
Progress Payments
Partial payments made for work completed to date, common in long-term projects to provide cash flow to contractors or suppliers before the final product is delivered.
Contractor
A person or company that undertakes a contract to provide materials or labor to perform a service or do a job.
Billings
The total amount of business conducted or billed to clients over a particular period, often used in professional firms.
Construction Inventory
Goods and materials held by a company for use in the production or construction of projects, not yet completed or sold.
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