A liter of aviation kerosene TS-1 costs 250 rubles (2.5 dollars), and in KSP 50 units of liquid fuel cost 50 credits, and the MK0 tank itself is 0.625 by 1 meter, that is, approximately 0.3 cubic meters of volume, that is, less than 300 liters. If you take 300 liters for 50 units of fuel, then one unit of fuel is 60 liters, that is, one credit is 275 * 60 ~ 16,500 rubles or 162.27 US dollars. A lot of water has flowed under the bridge, damn, it was more than four years ago. And google translate is reaching new heights, it's only my laziness that prevented me to write me on my own