

For First Solidus Nomisma, the Nummi is 1/7200 of a Solidus and a Follis = 40 Nummus, so it equals that 1 Solidus = 180 Follis.
Why in the second line it says 1 Solidus = 288 Follis? That's valid only for Second Solidus Nomisma, and shouldn't be shown there.