Why not? Both games were played at the same difficulty. In the first game, he had only one city, in the second game, he had more. However, the increase in cost always increased by 20.your formula doesn't even work for these five numbers but I wish you luck !
Oh, I see. Yes, hadn't formulated that very well, had I?
Let me try that again:
[cost of new policy] = [cost of previous policy] + f([# of cities]) + 20*[# of existing policies]