(1)There shall be ascertained in accordance with the rules set out in the Fifth Schedule to this Act as respects every county borough, whether the operation of Parts I, V and VI of this Act would apart from this and the next following section result in a gain or loss to the borough and the amount of the gain or loss:
Provided that, if a county borough comprises two or more separately rated areas, the gain or loss of each area shall be so ascertained, and the gain or loss of the county borough as a whole shall be the amount by which the gains exceed the losses or the losses the gains of the several areas.
(2)Section ninety of this Act shall apply to county boroughs as if for references to counties and the county apportionment there were substituted references to county boroughs and the county borough apportionment, and as if for the words " the amount of the loss on account of rates and grants of that county " there were substituted the words " an amount equal to the county borough apportionment for the first fixed grant period increased by the loss or reduced by the gain of the borough as a whole, as ascertained under subsection (1) of section ninety-six of this Act. "