Shhhh on that stuff. You make it sound like everything in construction and mining and the like is guesswork and surprise. You should know that every cost and exigency can be figured out to the penny and quoted off the top of the head with profit figures included at a moment's notice. And when they ask how much you are making, you can say ten per cent without even averting the eyes or saying "uhh...". If that ten was negative it would be as right as rain half the time anyway.
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