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________________ is the amount provided in the estimate and bill of quantities for some specialised work to be done by a specialised firm; whose details are not known at the time of preparing estimate.

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________________ is the amount provided in the estimate and bill of quantities for some specialised work to be done by a specialised firm; whose details are not known at the time of preparing estimate.

(a) Prime cost

(b) Provisional sum

(c) Capital cost

(d) Building cost index

I had been asked this question in exam.

Asked question is from Different Types Of Estimates in portion Irrigation Works, Culverts, Bridges and Wells of Civil Engineering Drawing

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Right option is (b) Provisional sum

Easiest explanation: The work like installation of refrigerating machine; installation of lift, air conditioning, etc., for which full information and details may not be known at the time of preparing estimate and entering into contract and are require to be installed by a specialised firm, a sum.

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