Basically anything under 100% is feasible to finance without too much cost to the public. And once you get to the point where you want to go on an austerity bud

Basically anything under 100% is feasible to finance without too much cost to the public. And once you get to the point where you want to go on an austerity budget the point is to lower the deficit in most cases, not pay down the debt (which would slow the economy, which you need to increase so that your debt slowly becomes a lower percentage of GDP).