If there are delays in crediting sales or debiting returns or
allowances which affect the computation of commissions, the amounts paid
to the employee for the computation period will be accepted as the total
commission earnings of the employee during such period, and the
commission may be allocated over the period from the last commission
computation date to the present commission computation date, even though
there may be credits or debits resulting from work which actually
occurred during a previous period. The hourly increase resulting from
the commission may be computed as outlined in the preceding paragraphs.