23.—(1) For the purposes of regulations 19 (average weekly earnings of employed earners), 21 (average weekly income other than earnings) and 22 (calculation of average weekly income from tax credits), where the period in respect of which a payment is made—
(a)does not exceed a week, the weekly amount shall be the amount of that payment;
(b)exceeds a week, the weekly amount shall be determined—
(i)in a case where that period is a month, by multiplying the amount of the payment by 12 and dividing the product by 52;
(ii)in any other case, by dividing the amount of the payment by the number equal to the number of days in the period to which it relates and multiplying the quotient by 7.
(2) For the purposes of regulation 20 (average weekly earnings of self-employed earners) the weekly amount of earnings of a claimant shall be determined by dividing his earnings over the assessment period by the number equal to the number of days in that period and multiplying the quotient by 7.