Talk:Medieval Castle/@comment-4102115-20120605111714/@comment-4935290-20120605144111

Upgrade cost 1 = Building Cost ($) / 4

In case of buildings costing € make that:

Upgrade cost 1 = Building Cost (€) * 1100 / 4

In any case:

N > 1 => Upgrade Cost (N) = Upgrade cost (N-1) * 1.7

Other formulas:

Upgrading Time 1 = Constructing Time / 2

N > 1 => Upgrading Time (N) = Upgrading Time (N-1)

N > 1 => Income Money (N) = Income Money (N-1) * 1.15

N > 1 => Repair Cost (N) = Repair Cost (N-1) * 1.20

There are rounding problems so the results may sometines be +/- 1 of the real result.