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The unit rate method estimates cost by multiplying a measured quantity by

  • A.a factor derived from the equipment cost
  • B.the capacity ratio raised to an exponent
  • C.the ratio of two cost indices
  • D.a cost per unit taken from records or a schedule

Answer: D

Rates per cubic metre of concrete or per metre of pipe are held in a schedule and applied to the quantities taken off. It sits between analogy and full detail in both effort and accuracy, and is the workhorse of construction estimating.

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