The bottom quote is found out at this link.

The break-even price is the first thing oil companies establish in order to determine if drilling a new well makes financial sense. From the break even price, profitability can easily be determined with the following formula:

Profitability =

(Price of Oil – Break Even Price) / Break Even Price

For example with oil at $100 and a break even price of $50, profitability is 100%. But with oil at $60 and the same break even price, profitability drops to 20%

By dialing their target profitability first, oil companies then determine if a new drilling project is feasible. Needless to say, with oil retailing now at $100, more wells will be drilled in deeper, harder to reach places than were previously profitable.

The following table provided by the Bank of Kuwait gathers current reported break-even prices of major oil producing nations:

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Based on the formula, profitability of these countries’ oil operations are in order:

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(If you noticed or haven’t noticed, I created screenshots of the two graphs instead of just copying/pasting them.)