I have calculated  contribution.

Each 200 you donate you get 1 contribution, "Regardless of which resource".

Every 200 resource = 1 Contribution

10 Money = 1 Contribution

For best Alliance Contribution, it seems like you can get alot

if you sell crop and then donate the money,

200 crop X .10 = 20 money

So it seems selling crop first and then donating it rather than donating crop itself is better.

It is better to sell crop and donate the money. It is also better to donate the resources rather than sell them.

>When you donate coins:
It is 1000 contribution per coin.

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