Engineering Economics
If interest is paid more than once in a year, ‘i’ is the rate of interest per year, ‘n’ is the number of periods in years and ‘m’ is a number of periods per years, compound amount factor (CAF) is:

(1 + i/m)1/n
(1 + i/n)m
(1 + i/m)n
(1 + i/n)1/m

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

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