when talking about sales figures always zero
and they still employ you?

I usually use zero but find myself saying "Oh" sometimes. And what do people do with double and triple figures? Is 55 "five five", or "double 5". Does anyone say (as in France and Germany?) paired digits as in "twenty-seven, fifty-five, thirty" ? (In Germany, I found this very confusing as the digits are reversed, sieben und zwanzig...) Is 555 "triple 5", "five five five", "five double five" ?
Any national/regional differences or is it all personal preference?
Rod