Price/credits or every action

Is there any chance you guys can actually specify? How many credits it'll use for whatever option you do? Because I have repeatedly bought the a hundred and 2 hundred thousand and even 1 million credit packs. And yet i still dont know how sometimes,it’ll deplete like 30000 credits and other times it doesnt. Why cN’t y’all say how kuch something costs so we can decide whether or not to do it???