Unit Prices are used to bid a cost for product replacement when the extent of the replacement is unknown. Which option best reflects this use?

• A. They set the final project budget after the bid
• B. They determine profit margins for subcontractors
• C. They bid a cost for product replacement when the extent is unknown
• D. They replace alternates in the project manual

Answer: (C)

Unit prices are used when the amount of work can’t be determined at bid time. By pricing a unit of measure (per item, per square foot, per unit, etc.), a contractor can apply that rate to the actual quantity discovered later for product replacement. As the extent becomes known, the total cost is simply the unit price multiplied by the measured quantity. This mechanism allows pricing for uncertain scope without re-bidding the whole job, and it directly reflects how replacements or changes with unknown extent are valued.

That makes the option describing bidding a cost for product replacement when the extent is unknown the best fit. The other ideas describe outcomes or processes that unit prices don’t specifically govern—final budget setting, profit margins, or replacing alternates in the project manual.