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# In most cases the cumulative error from these

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Unformatted text preview: lays the one closest to zero. However, the displayed solution has no financial meaning. Thus, you should use caution in making investment decisions based on an IRR computed for a cash-flow stream with more than one sign change. The following time line shows a sequence of cash flows with three sign changes. There may be one, two, or three solutions for IRR. Sign change Sign change Sign change When Solving a Complex Problem When you are solving very complex cash-flow problems, the calculator may not be able to find IRR even if a solution exists. When this is the case, the calculator displays Error 7 (iteration limit exceeded). 84 Appendix A: Reference Information The Algebraic Operating System (AOS ) If you select AOS (rather than Chn) as the calculation method in the Format worksheet, the calculator uses the standard rules of algebraic hierarchy to determine the order in which operations are performed. Algebraic Hierarchy The table below shows the order in which operations are performed when AOS is selected as the calculation method. Priority Operations 1 (highest) x 2, x!, 1/x, %, 2 nCr, nPr 3 yx 4 ,P 5 +, - 6 ) 7 (lowest) x, LN, e 2, HYP, SIN, COS, TAN = Battery Information The calculator uses one lithium manganese battery for about 1500 hours of operation. You must replace the old battery with Union Carbide (Eveready) CF2032, Duracell DL2032, or the equivalent. Knowing When to Replace the Battery If the display begins to dim (especially during calculations), it is a sign that the battery is starting to weaken. When you find it difficult to read the display under normal viewing conditions, the remaining battery life may be only about one week. Effects of Replacing the Battery The calculator cannot retain data when the battery is removed or becomes discharged. Replacing the battery has the same effect as resetting the calculator with the key sequence. Appendix A: Reference Information 85 Replacing the Battery To replace the battery, follow these steps: 1. Turn the calculator off and turn it over so that the back is facing you. 2. Place your thumb on the battery cover where it is marked with raised lines. Press and slide until the...
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