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

Annuity due
Perpetuity
Deferred annuity
Ordinary annuity

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Engineering Economics
Using factor method, the depletion at any given year is equal to:

Initial cost of property times number of unit sold during the year divided by the total units in property
Initial cost of property times number of units sold during the year
Initial cost of property divided by the number of units sold during the year
Initial cost of property divided by the total units in property

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