Usually 24, 247, 360 are popular numbers and combined with a strong keyword they create a domain of value. 'Percent', 'beer' and 'wine' are pretty good but the numbers aren't I'm afraid. That said, there are some sales on Namebio for domains containing '420' but they're generally lower than 360 sales for example. Maybe someone with experience in the field can shed some light on this. Maybe 30Percent could be used for an alcoholic beverage with an alcohol content of 30%. Anyway, good luck with them!