It means mark up. But, I can't remember how to use it. I know you can find out how much a 15% markup on something would be, etc., but I've got to figure out how to use it again. It's been awhile.
Hope this helps explain the maths...
£100 x 15 MU gives £115...ie same as x 1.15
No idea what the plus minus divide buttons do, probably spurious answers
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It stands for mark up.
no button you gotta work it out yaself
the via button means the variable.
There should be a negative button on your calculator, separate from the minus button. Press that button before pressing the buttons for the numbers of the exponent.
the pi button always located on the top of 'EXP' button.