What are these for?

[tweedledee]

I have a new calculator and can't work out what these 3 keys are for. Can anyone assist, please?

[img]https://forum.videohelp.com/images/guides/p1471807/
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[SquirrelDip]

The first is round off -> round down, round 5 up / 4 down and round up

MU is for Mark Up and GT is Grand Total. Your manual should explain how they work but if you don't have then this should help:

MU: MU stands for Mark Up, which is for calculating GROSS PROFIT MARGIN (GPM) used in business environments. There are two methods of calculating this, depending on the model of the calculator.
example 1. Enter 100 then press the divide key, then enter 15 then press the MU key, which displays 117.65 (15% of this total equates to 17.65)
example 2. Enter 100 then press MU key, then enter 15 then press the % key, which displays 117.65 (15% of this total equates to 17.65)

GT: The Grand Total key is used to show the cumulative total of your calculations (some models need to have the slide switch set to "GT" to operate. The Grand Total function automatically cumulates the entries you calculate when pressing the = key
e.g.: enter 6 x 6 = Should display 36 then enter 10+5= Should display 15, if you hit the GT button it will display the total of these two sums 51.

[Xylob the Destroyer]

that's more of an adding machine (or "ten key") than a calculator
what's the difference?

"adding machine" is geared more towards financial calculations. which is why it has the double zero key and the automatic decimal placement switch. if you put it to the "A", it will automatically put the decimal before the last two digits. that way, when you type in 12345 and hit the + key, it will automatically make your input 123.45
also, it is set up to keep a running total, and assumes when you use the + & - keys that you want to do just that
if you want to subtract 7 from 10 for example, on a calculator you would press 1, 0, -, 7, = and get 3 for your answer
BUT, on an adding machine if you were to do that exact same key sequence, it would make 10 a negative number.
to subtract 7 from 10 on an adding machine, you would press 1, 0, +, 7, - and it would display 3. no need to use the = key (that's for multiplaction and division functions).

calculators are for solving math problems (science stuff and math classes).
adding machines are for money stuff.

[tweedledee]

Thank you gentlemen.

[Doramius]

It probably has 10 or 12 digit viewing capability, rather than the 8 digit viewable most calculators have. Deffinitely more like an adding machine without the ticker tape.