question about town upkeep

[dunehammer2014]

i go a town and i know the basid upkeep will be 10silver per 6 hour, now i want to expand it, i dont know how many upkeep the flag and the boundary stone will increase, the wiki writes flag have 75 upkeep, the stone is 45 upkeep, but how many silver i must add if i have 1 more flag or boundary stone?i dont know what is the calculation between upkeep and money it will take.

[Droj]

afaik

Amount = (Upkeep / 18.75) * Period in days

so, for 1 day;
adding a flag

a = ((750+75) / 18.75) * 1
a = 44

bell will consume an extra 4 silver per flag, per day.