Mongols unique influence mechanic allows them to double produce, usually for their normal cost duplicated in stone. However, the shaman, trader and mangudai are oddly different.
Shaman: 150g, Shaman x2: 100g, 200s
Trader: 75w, 75g, Trader x2: 74w, 74g, 150s (doesn’t appear to be UI rounding)
Mangudai: 120w, 40g, Mangudai x2: 130w, 30g, 160s
Villagers are also different, at 50f for one, but 50f, 150s to duplicate, but that’s totally fair otherwise Mongols would do nothing but double produce vills.