You don't know? Let me help you?
80,000 divided by 20 is 4,000
You want 2,000,000. So you can:
Divide 2,000,000 by 4,000 (your result from before). This is:
500
You have to play 500 duels. It's really not that hard to compute.
Taki it's already 2021 and you're still clinging to your old habits. You're getting older, I'm getting older, so stop the showoff business already and chill like an adult you are. Man, don't cling to pride every time.