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Over the years, I have received countless questions about financial calculators. I will compile a perform of the most frequently asked inquiries here.

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Q: as soon as using the NPV and IRR functions, have the right to you describe the optional cash circulation counts part?

A: Sure. That function is over there to save some data entry in particular circumstances, and it offer an identical purpose to the frequency prompt in countless other gaue won calculators. If several of your cash operation repeat, then you can incorporate the \"cash flow counts\" array. Allow me offer you an example:

What is the present value the the following series of cash operation if the discount price is 8% per year?

100, 200, 200, 200, 300.

Normally, you could solve this difficulty using the NPV function as follows:


but an alert that you had to kind \"200\" three times in a row. Making use of the \"cash circulation counts\" selection we can do it like this:


Either way, girlfriend will discover that the existing value is $774.01. However, the second an approach saves a small bit that typing and is less likely to bring about data entrance errors. That doesn't really save much time in this simple example, but in other troubles it can. Be conscious that if you use the \"cash flow counts\" array, girlfriend must go into a freqency for each that the cash operation — even those that don't repeat.

Q: The TI-84 Plus manual tells me to usage lists in the NPV and also IRR functions. Why don't you usage them?

I'm a rebel! Seriously, I just think the it is quicker and also easier to develop on-the-fly arrays fairly than usage lists. For most of what i do, I'm not going come reuse a list more than as soon as or twice anyway. Once I carry out want to reuse it, I deserve to usually usage the editing functions to easily get the done.

Q: Why am I acquiring an error as soon as I usage the NPV and/or IRR function?

Well, the depends. Many often, the errors the I see in course are resulted in by somebody no being careful about separating each variable in the duty by commas. Every comma the you view (above) is for sure required. One more frequent reason of errors is neglecting to make the early stage outlay a an adverse number. You have to obey the cash flow sign convention even if it is you room using the TVM Solver or the functions.

Q: just how do ns calculate the number of days in between two days using the TI 84 Plus?

A: The TI 84 Plus support two day formats, MM.DDYY or DDMM.YY. You calculation the difference in between two job by making use of the dbd (days between dates) duty from the Finance menu. Because that example, to find the variety of days in between 25 July 2007 and also 31 December 2007 you would type:

dbd(08.2507,12.3107) if you room using MM.DDYY


dbd(2508.07,3112.07) if you room using DDMM.YY

Either way, you will find that there space 128 days between those 2 dates.

Note that the TI 84 Plus walk not enable you to specify a day count basis (e.g., 30/360 or actual/360). The basis is always actual/actual.

Q: exactly how do I discover roots other than square roots utilizing the TI-84 Plus?

In finance it appears that we space forever calculating assorted roots (cube root, 4th root, 365th root, etc). Fortunately, this is pretty an easy to execute if you can remember a straightforward mathematical rule:

\\<\\sqrtX = X^\\frac1N\\>

So, to calculate the fifth root of 100, we simply raise 100 come the 1/5th power. To carry out this on the TI-84 add to type: 100^(1/5) ENTER. In this example, the fifth root of 100 amounts to 2.51189. Keep in mind that the parentheses are important, otherwise you would certainly raise 100 come the 1st power and then division by 5 and you would obtain 20 together the answer. Making use of this technique you deserve to calculate any type of root.

Q: my calculator only has a crucial to calcuate natural logarithms. Exactly how do i calculate logarithms to other bases (say, base 10)?

A: many often, in finance, us use natural logarithms (base e), usually abbreviated as Ln(x). However, occasionally we must use various other bases. Converting from basic e to any other base deserve to be done through the following formula (I'm converting to base 10):


So, simply calculate the herbal log of your number (use the LN key), and also then divide it by the organic log of the new base. Because that example, Log10(3) = Ln(3)/Ln(10) = 0.478. Keep in mind that the TI-84 add to does have a LOG an essential for calculating base 10 logarithms. Still, if you need an additional base the above formula will occupational — just change the 10 to your selected base.

Q: How can I clean the storage of every variables and lists?

A: uneven a complete reset (see below) this is pretty for sure to do, despite be careful not to delete any type of lists or variables that you need to save. To clean all memory in a TI 84 Plus:

Press 2nd MEM (that is the second role of the + key)Select 2 (Mem Mgmt/Delete)Select 1 (All)Scroll through the list and also delete anything the isn't crucial using the DEL button.To exit, press 2nd QUIT.

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Q: How can I fully reset my TI 84 Plus back to the factory default settings?

A: Be cautious with this together it will certainly remove any programs the you may have stored in the calculator. With that disclaimer stated, here's exactly how to reset it:

Press 2nd MEM (that is the second duty of the + key)Choose 7 (Reset)Scroll appropriate so the ALL is selectedPress 1Press 2 (Reset, and read the warnings)

Note that it is feasible that a reset may affect the contrast of your screen. If necessary, friend can adjust the comparison of the screen on the TI-84 through pressing 2nd and climate the up arrow (or under arrow) button. You may have to do this repeatedly.