How many coins to get to lvl 20 crop?

As the title says, It cost 10 coins to get to lvl 16, and the next upgrade is 25 coins. How much am I looking to spend to get all the way to lvl 20? This is such a PITA i dont think i will ever get it to lvl 20...

When will it start requiring coins?

You resources after lvl 15 u need coins.

you need hundreds of coins each city... (you need to be filthy rich! i only know one guy who has max crop and it was because his billionare friend bought it for him. and still it was a big favor for him:( this is a gameof whoever spends the most money not very much strategy)

225 per or 900 total for each city if I remember correctly.

thats why most people dont know the answer because most cant afford or doesnt want to spend the small fortune on a game

Most MMOs require a monthly fee and dont let you play them unless you pay. If they've figured out how to make everyone happy by making a system that lets them make money (therefore having a game to begin with) and letting everyone play for free, then more power to them!

Exactly! Somebody gets it