How to Calculate Net Revenue Retention

If you've got a highly predictable improvement ramp period of three to six months just consistently say that's going to be my new ARR and anything after that is expansion AR. We actually in the SaaS metric standards board when we were talking about these metrics we said you got to have vendor specific objective evidence of when it's new and when it's expansion excellent. Ray, if you're tempted to do it on net new ARR because you want to know how much it costs to make the water level of the bucket go up I would recommend looking at burn multiple or well is it included it's kind of indirectly including CAC payback period is it sufficient risk margin CAC?