Engineering Economics
What refers to the cost of borrowing money or the amount earned by a unit principal per unit time?

Economic return
Rate of interest
Yield rate
Rate of return

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Engineering Economics
Pick up the correct reason for making conceptual (or preliminary) estimate from the following:

To have a check on a definitive cost estimate
All of these
To check quotations from contractors and/or sub-contractors
To compute target estimate for the owner while drawing and specifications are in initial stage

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