As some of you know when you receive gold from the AH you only get 95% of the original price you put it up for (5% off).. but what most of you don't know is that you can undercut quite a bit trading items in person... This well give you FULL value of the item.
For example:
I put up a Eternal Fire up on the AH for 20g.. Someone bought my eternal fire, but for some reason I only got 19g because they take 5% off...
So how can I use this for my advantage?
You can sell your items using trade channel and undercut 5% off to make it look like there getting a better deal (which they are), but the only difference is your selling your items faster.
So how do I subtract 10% off?
Move the decimal point one place to the left, to compute 10%. Then subtract that amount from the original price. For example, if it costs $29.95. 10% off, would be $2.99 - then you subtract $2.99 from $29.95. which is $26.96.
Edit: To compute 5% all you have to do is cut the 10% in half.
(Hi there, how do i calculate 10% off a product? - Yahoo! Answers)
The only difference is that wow uses gold, silver, and copper.. which can be a bit confusing for items that sell for like 19g25s.. but for the items that cost 1000g+ its farely easy, for example.. if your selling a item for 1000g+ you can under cut a lot in trade channel.. For instance, there are prisms deck on my server going for 1200g each, and I just couldn't sell them.. so I did the math and turned 1200g into $12.00, then moved the decimal point one point to the left so it was 120g..Then half 120g, which is 60g, then subtracted 60g from 1200 and then sell it for for 1140g.
For double digits all you have to do is look at the first digit, then subtract that off the original amount.. So 10% off of 50g would be 45g.
Also, you can multiply by .95 to get 5% off,
I have used this method a lot to sell abyss crystals, abyss crystals are 100g on my server, but subtracting 5% off and selling it in trade for 95g.. But I usually under cut a bit more, and compute 10% (selling abyss crystals for 90g are even more faster than 95g)
Sorry for everyone when i first made this post saying it was 10% off, I was wrong. Sorry.