I think there is a calculation error for RDM (for FB). Explorer is correct, but all the other levels are wildly too high.
Explorer = 1 EUR x 4
Silver= 1 EUR x 6
Gold= 1 EUR x 7
Platinum= 1 EUR x 8
If I enter a cost of 1927, Explorer shows correct at 7704 RDM, Silver shows incorrect at 19260 (should be 11562ish).