Engineering Economics
What is the type of annuity where the payments are made at the beginning of the each period starting from the first period?

Ordinary annuity
Annuity due
Deferred annuity
Perpetuity

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

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