3. Where the claimant occupies a dwelling as his home and he provides in that dwelling board and lodging accommodation, an amount, in respect of each person for whom such accommodation is provided for the whole or any part of a week, equal to—
(a)where the aggregate of any payments made in respect of any one week in respect of such accommodation provided to such persons does not exceed £20·00, 100 per cent. of such payments; or
(b)where the aggregate of any such payments exceeds £20·00, £20·00 plus 50 per cent. of the excess over £20·00.