Even if you are mining and selling immediately each week / month you will make profit. Enough to make it worth it? Probably not. The added electric is $50-$60 a month. And immediately selling coins would be like $300 for the month. So $240 profit a month.
But you can do better things such as mining the most profitable coin and selling then trading right away. Make more gains.
Or mining a coin you are going to hold for a bit. BCI right now the coin. Been mining and holding.
Based on what? Nvidia cards? Amd? 7 of them? 20 of them? 50 of them? Electric $50-$60 a month? How do you know what the cost of power is in any given city? Again, how many cards and what type determines power usage. What if coin prices go up...then so does profit. Same with down. So your answer(s) is so arbritary it isnt even funny.