Engineering Economics
What refers to the ratio of the interest payment to the principal for a given unit of time and usually expressed as a percentage of the principal?

Rate of return
Yield
Return of investment
Interest rate

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Engineering Economics
In a cash-flow diagram:

A vertical arrow pointing up indicates a positive cash flow
Time 1 is considered to be the end of time period 1
All of these
Time 0 is considered to be the present

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