What did I list that at?

Hypothesis: It should be possible to calculate what you listed something at, by looking at the messages when you collect inf.

My belief is as follows:

* When I list something, I pay up front 5% of the price for which I list it.
* When I sell something, I pay WW 10% of the price for which it sold, LESS that initial deposit.

Imagine, then, that I list something for 100 inf, paying a 5 inf deposit.
* If I sell for 100 inf, I should collect 100 inf, and pay 5 back to WW.
* If I sell for 200 inf, I should collect 200 inf, and pay 15 back to WW.

What this gives us is, I believe, a formula for figuring out what the listed price was, in the cases where we've forgotten. Specifically:

For a sale at x inf, with y paid back to WW, listing fee f, and initial price p:

* The sale fee is x / 10.
* The money actualy paid to WW (y) is (sale fee) - (listing fee)
* So I now know that ((x / 10) - f) = y
* Therefore, ((x / 10) - (p / 20)) = y
* Therefore, (x / 10) = y + (p / 20)
* (x / 10) - y = (p / 20)
* 2x - 20y = p

So if I listed at 100 inf, and sold for 200, I should see x 200, y 15. 400 - (15 * 20) = 100.

VICTORY FOR ZIM!

... Assuming I had the base numbers right. Do I?

Your base numbers are right, and so is your calculation.

See, this is when I start really missing the purely hypothetical not related to another MMO I used to play thing of having a completely programmable user interface in Lua. Because it'd take all of a minute to hack in a "N (listed at M)" thing.

Good old algebra. Nothing beats algebra!

Thinking about it, it may be easier to specify as "20 * (x/10 - y)". That way, you're pretty much just lopping the last digit off x, which is easy, and subtracting y, and then multiplying. (Or, if you're a programmer, just do two left shifts, one base two and one base ten.)