what is the PERFECT income for ONE person to live comfortably?

Depends where you live.. Cost of living varies.

Well, that depends.... what you might need to live comfortably in say central London is going to be very different to what you need in the back end of Nigeria.

You need to give a bit more detail than you have given, if you want a decent answer Ashley 

Depends where in the world you are living, how and where you want to live, and what you deem essential.

$150k should do it. $200k would make me feel better than just $150k annually.

Depends on which area of the country you live in and what that area has as standard of living.

Everyone is different and the income in New York city would be very different from the rural heartland.  You need to figure out what you are currently actually spending each month and then see if that's a valid number (ie add or subtract to that number for anything you really don't need or do usually need).  Might want to add at least 10% to the number as an emegency fund.

There is no real answer for that. What is perfect for you is not perfect for the next person.

I recommend you write down two columns. Label one NEEDS and the other WANTS. NEEDS are: food, clothing, rent, insurance, etc. WANTS are a car (unless you live in an area where there is no public transportation) , new phones, TVs, dining out, Starbucks, entertainment, etc. Those are your expenses. The fewer WANTS you have the more money you can save.

That depends on where the person chooses to live and what sort of relaxation they engage in.

Spiritually speaking, we don't live in a perfect world so there are no perfect incomes. There will always be something to pay, no matter how small - water, garbage, taxes. Which is why I'm looking forward to seeing this prophecy fulfilled (Isaiah 65:21, 22) They will build houses and live in them, And they will plant vineyards and eat their fruitage. 22 They will not build for someone else to inhabit, Nor will they plant for others to eat. For the days of my people will be like the days of a tree, And the work of their hands my chosen ones will enjoy to the full."

Greatly depends on where you live. I live comfortably on $20k. But I own my house and car and am frugal.

If you have rent & a car payment and if you live in an expensive area, you would need much more.