Earn 50 interest in a single game? What is "interest" and how to earn it?

I had around 50 gold in 2 games now but I didn't get the mission..I'm confused :(

Pretty self explanatory thus no guide.. But like pyro said, for every 10g you have at the end of a turn, you get 1 gold interest capping at 50 gold/ 5 interest per round. Earn 50 gold this way and voila, mission completed.. Pretty easy quest. Much less chance than getting 1st/2nd place for the next quest.

You can find fast any information on google.

Interest is +1 with every 10 gold you have, +5 gold is the maximum amount of interest you can earn per turn capped at 50 gold

Hold your income at around 50 Gold for couple of rounds. Some say - it doesn't work if you have 60+ gold - so keep it under and it should work.

you should get exactly 50 gold, like exactly "50", and keep it like that for a round i think and it should work.

So basically to get this 50 interest in a single game... I'll have to not spend any gold? I'd have to save up 50 gold which gives me 5gold interest after each round, right so far? So that would be 10 rounds at 50 gold... but if i get 1 gold for every 10 gold i have, that complicates the math a bit more. If you win or lose in a streak, you get different amounts of gold at the end of each round, lets just do an average of 4 gold per round. 10**+1**=11(rnd 1) +1=12 +4=16(rnd 2) +1=18 +4=22(rnd 3) +2=24 +4=28(rnd 4) +2=30 +4=32(rnd 5) +3=35 +4=39(rnd 6) +3=42 +4=46(rnd 7) +4=50 +4=54(rnd 8) +5=59 now lets just say I keep my gold at 50 each round from here on... +5=50(rnd 9) =26 interest so far +5 (rnd 10)=30 interest +5 (rnd 11)=35 interest +5 (rnd 12)=40 interest +5 (rnd 13)=45 interest +5 (rnd 14)=50 interest! I'd roughly have to stay alive for around 14 rounds to achieve this goal... who said coming in 1st or 2nd is harder??