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Over the years, I have actually obtained many concerns around financial calculators. I will compile a list of the the majority of generally asked concerns below.

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Q: When using the NPV and also IRR functions, can you define the optional cash circulation counts part?

A: Sure. That feature is there to save some data enattempt in particular circumstances, and also it serves an identical objective to the frequency prompt in many kind of other financial calculators. If some of your cash flows repeat, then you have the right to include the "cash circulation counts" array. Let me provide you an example:

What is the present value of the adhering to series of cash flows if the discount rate is 8% per year?

100, 200, 200, 200, 300.

Typically, you can deal with this trouble making use of the NPV feature as follows:


however notice that you had actually to form "200" 3 times in a row. Using the "cash flow counts" array we have the right to do it prefer this:


Either way, you will certainly find that the present value is $774.01. However, the second strategy conserves a tiny little of inputting and also is less most likely to result in data entry errors. It doesn't really save a lot time in this straightforward instance, yet in other troubles it have the right to. Be mindful that if you usage the "cash circulation counts" selection, you have to enter a freqency for each of the cash flows — also those that don't repeat.

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

I'm a rebel! Seriously, I simply think that it is faster and also simpler to create on-the-fly arrays fairly than usage lists. For the majority of of what I carry out, I'm not going to reuse a list more than as soon as or twice anymethod. When I do desire to reusage it, I have the right to commonly usage the modifying features to conveniently acquire it done.

Q: Why am I gaining an error once I use the NPV and/or IRR function?

Well, that relies. Many frequently, the errors that I view in class are brought about by somebody not being mindful around separating each variable in the attribute by commas. Eexceptionally comma that you see (above) is absolutely required. Anvarious other frequent reason of errors is neglecting to make the initial outlay an adverse number. You need to obey the cash circulation sign convention whether you are utilizing the TVM Solver or the functions.

Q: How do I calculate the number of days between 2 days using the TI 84 Plus?

A: The TI 84 Plus supports 2 date layouts, MM.DDYY or DDMM.YY. You calculate the difference in between two days by making use of the dbd (days in between dates) feature from the Finance menu. For example, to discover the number of days in between 25 July 2007 and 31 December 2007 you would certainly type:

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


dbd(2508.07,3112.07) if you are making use of DDMM.YY

Either way, you will discover that tbelow are 128 days in between those 2 days.

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

Q: How execute I find roots various other than square roots utilizing the TI-84 Plus?

In finance it appears that we are forever before calculating assorted roots (cube root, fourth root, 36fifth root, etc). Fortunately, this is pretty basic to perform if you can remember a straightforward mathematical rule:

X = X^frac1N>

So, to calculate the 5th root of 100, we simply raise 100 to the 1/5th power. To execute this on the TI-84 Plus type: 100^(1/5) ENTER. In this example, the fifth root of 100 equates to 2.51189. Keep in mind that the parentheses are important, otherwise you would raise 100 to the first power and also then divide by 5 and you would acquire 20 as the answer. Using this approach you deserve to calculate any root.

Q: My calculator only has an essential to calcuate organic logarithms. How perform I calculate logarithms to other bases (say, base 10)?

A: Many often, in finance, we usage natural logarithms (base e), generally abbreviated as Ln(x). However before, occasionally we should use other bases. Converting from base e to any type of other base deserve to be done through the following formula (I'm converting to base 10):

So, just calculate the herbal log of your number (usage the LN key), and also then divide it by the organic log of the new base. For example, Log10(3) = Ln(3)/Ln(10) = 0.478. Note that the TI-84 Plus does have actually a LOG key for calculating base 10 logarithms. Still, if you need an additional base the over formula will job-related — simply adjust the 10 to your schosen base.

Q: How deserve to I clear the memory of all variables and lists?

A: Unfavor a complete reset (watch below) this is pretty safe to perform, though be careful not to delete any type of lists or variables that you have to save. To clear all memory in a TI 84 Plus:

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

See more: Write The Chemical Symbols For Three Different Atomic Cations That All Have 10 Protons.

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

A: Be mindful with this as it will certainly rerelocate any programs that you may have actually stored in the calculator. With that disclaimer stated, here's how to recollection it:

Press 2nd MEM (that is the second function of the + key)Choose 7 (Reset)Scroll best so that ALL is selectedPress 1Press 2 (Reset, and also check out the warnings)

Note that it is feasible that a recollection might impact the comparison of your display. If vital, you can readjust the comparison of the display on the TI-84 by pushing 2nd and also then the up arrowhead (or down arrow) switch. You might have to execute this repeatedly.