Hi mammix2,

I did get it right eventually, on my 3rd time. I did complain to them that there was not much info on that question, like they listed all the variables you can use, but no rules of how to use them and similar. 2 of the admins were not helpful at all, while the 3rd one was great at pointing you where you went wrong instead of just saying "wrong" as the other 2. After my complaint they put some more info and made few more changes on their "how to" guide, so they clearly agreed that not all of their sellers are software programmers and they need to explain a bit more of the process and include the USD_in_GBP variable in their examples as people on their site are most likely to work with GBP and not USD.

I believe this was my correct answer:
200 | bitstampUSD_ask * USD_in_GBP * 1.04

You always start with the lowest amount you want to sell your BTC, which in your case is 1 and should be 200 like the question asks. You don't need to use the function "minprice(floor, param1=value1, param2=value2, etc)" unless you want to want to match the price of other sellers by including other criteria.

Hope this helps and best of luck with your exam