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

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Engineering Economics
In a cash-flow diagram:

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

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