Assuming a person eats 1/2 of meat a day, plus bread and other stuff, you could deduct that it would take about 8-10 Denarii per day for a person to feed themseleves.
The lowes wage, is for unskilled famer:
Farm laborer, with maintenance (daily) 25
Isn't it a bit hard to do that without a detailed, possibly subjective study of what the scarcities were in Rome? The dollar isn't anchored to the value of ten asses anymore, and salt is basically free.
It's a bit hard to make sense of this without seeing it converted into current units ($/lb or something).