The Best Way to Increasing XP II

1. Go to Market
2. Go to Decorations->Hay Bales and buy Hay Bale (the original yellow one for 100 coins) and place it on your farm
3. Now Click on the Hay Bale, and click Sell
4. Confirm to sell
5. Repeat from step 1 as long as you can afford the money

1 Hay Bale costs 100 coins. Selling it gives you 5 coins.

On buying 1 Hay Bale, you gain 5 XP, so, 95 Coins = 5 XP.

1 XP costs 19 Coins.