Per Unit Hard Costs of Rehabilitation $ = (a/c) + (b/d)
Where:
a = Rehabilitation hard costs for all assisted units (not including common areas and exterior surfaces)
b = Rehabilitation hard costs for common areas and exterior painted surfaces
c = Number of federally assisted units
d = Total number of units
Per unit Federal assistance = e/c
Where:
e = Total Federal assistance for the project
c = Number of federally assisted units
24 C.F.R. §35.915