Just a quick google:
https://www.google.co.id/amp/www.independent.co.uk/arts-entertainment/tv/news/game-of-thrones-showrunners-reveal-the-battle-budget-forced-them-to-cut-a7143041.html%3famp
And some also said it was 2.5 mils/episode, now it around 4 mils, that quite a mark up.
It's quite...