Engineering Economics
What is the type of annuity that does not have a fixed time span but continues indefinitely or forever?

Deferred annuity
Annuity due
Perpetuity
Ordinary annuity

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Engineering Economics
Which one of the following questions is relevant to the construction estimates?

Did the estimators precisely evaluate site conditions
All of these
Did the estimators use short cut methods which may be unrealistic in their situation
How much money will the contractor's risk, loosing if he were to submit bid on the raw estimate of cost

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