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

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Q: when using the NPV and IRR functions, have the right to you describe the optional cash flow counts part?

A: Sure. That function is there to conserve some data entrance in details circumstances, and also it serves an identical purpose to the frequency notice in many other gaue won calculators. If some of your cash flows repeat, climate you can include the "cash circulation counts" array. Let me give you one example:

What is the current value that the following series of cash flows if the discount price is 8% per year?

100, 200, 200, 200, 300.

Normally, you can solve this trouble using the NPV function as follows:


but notice that you had to form "200" three times in a row. Using the "cash circulation counts" selection we deserve to do it favor this:


Either way, girlfriend will discover that the existing value is $774.01. However, the second technique saves a little bit that typing and is much less likely to result in data entry errors. That doesn't yes, really save lot time in this an easy example, however in other troubles it can. Be conscious that if you usage the "cash flow counts" array, friend must get in a frequency because that each of the cash flows — even those the don't repeat.

Q: The TI-83 (and other) hands-on tells me to use lists in the NPV and IRR functions. Why don't you usage them?

I'm a rebel! Seriously, I simply think that it is quicker and also easier to create on-the-fly arrays quite than usage lists. For most of what ns do, I'm no going come reuse a list an ext than as soon as or twice anyway. Once I execute want come reuse it, I can usually use the modifying functions to quickly get the done.

Q: Why to be I acquiring an error when I usage the NPV and/or IRR functions?

Well, the depends. Most often, the errors that I check out in course are brought about by somebody not being careful around separating each variable in the function by commas. Every comma the you see (above) is certain required. An additional frequent cause of errors is neglecting to do the initial outlay a an unfavorable number. You have to obey the cash flow sign convention whether you room using the TVM Solver or the functions.

Q: how do i calculate the number of days between two dates using the TI 83?

A: The TI 83 and also 83 Plus assistance two date formats, MM.DDYY or DDMM.YY. You calculate the difference between two days by making use of the dbd (days between dates) duty from the Finance menu. Because that example, to uncover the number of days in between 25 July 2007 and also 31 December 2007 you would certainly type:

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


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

Either way, you will discover that there are 128 days in between those two dates.

Note that the TI 83 walk not enable you to specify a day count basis (e.g., 30/360 or actual/360). The communication is always actual/actual.

Q: how do I uncover roots various other than square roots using the TI-83 Plus?

In finance it appears that we are forever calculating assorted roots (cube root, fourth root, 365th root, etc). Fortunately, this is pretty an easy to perform if you have the right to remember a basic mathematical rule:

X = X^frac1N>

So, to calculation the fifth root of 100, we merely raise 100 come the 1/5th power. To execute this ~ above the TI-83 to add type: 100^(1/5) ENTER. In this example, the fifth root that 100 equals 2.51189. Keep in mind that the parentheses room important, otherwise you would certainly raise 100 to the 1st power and also then divide by 5 and you would acquire 20 together the answer. Using this an approach you deserve to calculate any kind of root.

Q: my calculator only has actually a vital to calculate natural logarithms. How do ns calculate logarithms to various other bases (say, base 10)?

A: many often, in finance, we use natural logarithms (base e), normally abbreviated as Ln(x). However, sometimes we have to use various other bases. Converting from base e to any kind of other base can be done v the following formula (I'm converting to base 10):

So, just calculate the organic log of your number (use the LN key), and also then division it through the natural log of the new base. For example, Log10(3) = Ln(3)/Ln(10) = 0.478. Note that the TI-83 add to does have a LOG vital for calculating base 10 logarithms. Still, if friend need another base the above formula will work-related — just change the 10 to your selected base.

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

A: unlike a complete reset (see below) this is pretty for sure to do, though be careful not to delete any type of lists or variables that you need to save. To clean all storage in a TI 83 or TI 83 Plus:

Press second MEM (that is the second duty of the + key)Select 2Select 1 (All)Scroll through the list and also delete anything the isn't important.

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Q: How have the right to I fully reset mine TI 83 or TI 83 Plus back to the manufacturing facility default settings?

A: Be mindful with this as it will certainly remove any type of programs that you may have actually stored in the calculator. With that disclaimer stated, here's just 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 impact the contrast of your screen. If necessary, girlfriend can adjust the contrast of the display on the TI-83 through pressing second and climate the up arrowhead (or down arrow) button. Girlfriend may have to do this repeatedly.