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Chemical engineering plant cost index is used for finding the present cost of a particular chemical plant, if the cost of similar plant at some time in the past is known. The present cost of the plant = original cost × (index value at present/ index value at time original cost was obtained). The most major component of this cost index is

A. Fabricated equipment and machinery

B. Process instruments and control

C. Pumps and compressor

D. Electrical equipments and material

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