Engineering Economics
The sunk costs include:

An unrecovered balance
An invested capital that cannot be retrieved
A past expenditure
All of these

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Engineering Economics
Which is NOT an essential element of an ordinary annuity?

Compound interest is paid on all amounts in the annuity.
The payments are made at equal interval of time.
The amounts of all payments are equal.
The first payment is made at the beginning of the first period.

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