1. I'm planning to upgrade to Lvl 3, but the capacity is only 0.0003. The minimum withdrawal amount is 0.0005, how can I withdraw with just a lvl 3 building?
2. This duration: 11 days.
Will my upgrading building be lost after 11 days? Do I need to upgrade again after 11 days?
3. I'm only at level 1 building (FREE) and its capacity is 0.00003, but I already have 0.00004 on my balance. I somehow dont understand.
As you know, each building has a limited duration in which you can claim from it. Let's take the level 3 building:
Duration: 11 Days
Rate: 0.00000127 Bitcoin/Minute
Capacity: 0.0003 Bitcoins
Cost: 0.01 Bitcoin
Now, to buy this building you need 0.01 Bitcoin, once you buy it, you can "CLAIM" Bitcoins from it after each 10 minutes (as stated in the new rules). For example, the capacity of the level 3 building is now full, you just have to solve the captcha and claim the amount of Bitcoins there is in the building.
This will give you the 0.0003 Bitcoins which is in the building AND the building starts making money again. This process will continue until 11 days pass, when this does happen, you return back to your level 1 (unlimited) building. So you can buy the level 3 building again or another building. Note: You will ALWAYS make double the amount of bitcoins it took to buy the building at first, but that is IF you don't reach the capacity of the building as it stops giving you bitcoins.
Now here's how you can calculate the total amount of bitcoins you can get by buying a building:
Change the Bitcoin per Minute to Bitcoin per Hour; 0.00000127*60 = 0.0000762 Bitcoins
Now change that value to the amount of hours in a day (which is 24 hours); so 0.0000762*24 = 0.0018288 Bitcoins
0.0018288 Bitcoins is the amount of money you'll gain without reaching the capacity of the building (that is just for level 3 building).
Now multiply that value to the duration of level 3 building; 0.0018288*11(days) = 0.201168 Bitcoins
As you can see, you get double the amount of bitcoins it took you to buy the building.
So if you buy the level 20 building for 10 bitcoins, you'll get back 20 bitcoins in 45 days. Thus, you can use 10 bitcoins from your 20 bitcoins to buy the level 20 building again.