R.I. Gen. Laws § 32-4-11: Percentage of state grants.

Grants under this chapter shall be made by the director. In the case of a single, local unit, the grant shall be in an amount equal to fifty percent (50%) of the nonfederal share of the cost of the lands, and in the case of two (2) or more contiguous local units that shall join together to present a joint comprehensive plan for the development of those units approved by their respective governing bodies, the grant shall be in an amount equal to seventy-five percent (75%) of the nonfederal share of the cost of the lands.