Engineering Economics
In a cash-flow diagram:

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

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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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