When beginning a TVM problem, always clear out the time value of money registers . If you don't do this every time, it is possible that a number stored in memory from a previously worked problem will cause you to compute an erroneous answer. When computing periodic interest rates do not re-enter the result by hand in your calculator . Enter cash outflows as a negative number . Most financial calculators require you to give information as to the direction of the cash flow.
Inflows are positive numbers and outflows are negative numbers.
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