(1) Subject to this section and to sections 122 and 124, the rate (in this Chapter referred to as "the scheduled rate") of unemployment assistance shall be -
(a) in the case of a person who, in any continuous period of unemployment as construed in accordance with section 120(3), has been in receipt of unemployment benefit or unemployment assistance for not less than 390 days, the weekly rate set out in column (2) at reference 1(a) in Part I of the Fourth Schedule,
(b) in any other case, the weekly rate set out in column (2) at reference 1(b) in Part I of the Fourth Schedule,
increased by -
(i) the amount set out in column (3) of that Part opposite that reference for any period during which the claimant or beneficiary has an adult dependant, subject to the restriction that the claimant or beneficiary shall not be entitled for the same period to an increase of assistance under this subparagraph in respect of more than one person, and
(ii) the appropriate amount set out in column (4)