Read the long post, no worry there, albeit yes, a more "open" writing (not sure how to say this in english, non congestioned ?) would help, especially when going with details.
While interesting, the main variable is missing (where are they living), since it change every thing (here, in France, broadband (1k dl, 300k ul) + mobile (40gb data, unlimited national + EU + some others (Arab country mostly, not a surprise) = 57 euros, about 60 USD ?
As to cost otherwise, it is indeed wildly dependant over where one is.
Going from 200 as to a country side apartment (+150 water + electricity), to more than fourth that in Paris and most others big city (even if they are some options as to lesser costs there, it has always demerit (data access, sound, neighborhoods etc).
As to cost, now (changed some weeks ago) one can install solar or wind energy related devices then use it as to power local (personal) equipment, which can make quite a distinction (there some options about water to, albeit it also induce quite some money related (upfront investment) (used water processing for example). Which was not possible before (it has to be sold toward the national company, at a special rate).
They are a lot of options, but as said when starting, it all depend as to where one live + what is (or not) know + understood.