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Here's how to use the MU/MD key. Say you want your item that COSTS you $120 to be priced such that you end up with a 40% margin. MU'MD calculates the final price to achieve the margin.
Enter: 120 X Enter: 40 MU'MD
Result: 200.00
Proof: 200 - 120 = 80 / 200 = 40%
Essentially the same as using the COST/ SELL/ MAR keys.
The Casio HR-100Tm manual is pretty pathetic. Expected a better one on their website, but alas.
Couldn't find a manual or user guide. The closest I got were two pages, one with the calculator, and one with the group of calculators that explains some of the functions.
Make sure you have the right AC adapter plugged in. I have two Casio printing calculators of different sizes with two different adapters. Though the input plug fits either calculator, only one of them is meant for the HR-100TM
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