Edit: Seems this is on Sailor difficulty, which gets double bonus...
Didnt the Statue of Maintenance start at 4%, then half for each one?
Meaning 5 statues should be: 4 + 2 + 1 + 0.5 + 0.25 = 7.75.
The statue need 6.0 maintenance before built. End result after 5 of them, is 5.2 maintenance needed.
Where does the extra 0.3 drop come from?
6.0 / 100 x 92.25 = 5.535 rounded to 5.5.
Even if the 0.5 and 0.25 counts as full 1%, that still only 9% total, not the 13%-ish you end up with.
I even went to the trouble of building 800+ of them, to test the math, but it stopped counting after the 5th one.
Given the 6th would be 0.125%, the game rounds 3 digits after 0 to 0?
I went that high, because I expected the game to round to the smallest number it could support.
Like, if it supported 4 digits as the lowest and rounded to it, 1000 statues extra would be 1% T2-T3 maintenance saved.