No employer shall be deemed to have violated the provisions, as outlined in Section 4(c) of the Act, by employing any employee of a retail or service establishment in excess of 40 hours per work week provided that:
In determining the proportion of compensation representing commissions, all earnings resulting from the application of a bona fide commission rate shall be deemed commissions on goods or services without regard to whether the computed commissions exceed the draw or guarantee.
D.C. Mun. Regs. Tit. 7, § 905