hi

im reading this text and confuse about the meaning, could you please explain to me?

it means 1% or 100% ?

"""in particular, they are subject to the non-affectation principle, according to which all expenditures are covered by the public budget, and in return all the revenue goes to the public treasury. All revenue gained is “taxed” by the public treasury at one hundred per cent as the subsidy is correspondingly reduced."""

thank you