(b) A broker's license shall be issued to any qualified applicant therefor, authorizing the whole or any part of the operations covered by the application, if it is found that the applicant is fit, willing and able properly to perform the service proposed and to conform to this chapter and the lawful requirements, orders, rules and regulations of the department thereunder, and that the proposed service, to the extent authorized by the license, is or will be consistent with the public interest and the policy declared in this chapter; otherwise, such application shall be denied. Each application for such a license shall be made in the same manner as is provided in paragraph (a) of section three for applications for certificates, and shall be accompanied by a fee, the amount of which shall be determined annually by the commissioner of administration under the provision of section three B of chapter seven for the filing thereof. The commissioner of administration shall determine annually, under the provision of section three B of chapter seven, reasonable fees which may be charged by brokers to shippers or motor carriers; provided, however, that no broker shall charge, for his services as a broker, any fee to any motor carrier engaged in dump truck operations, nor shall any such motor carrier pay any fee to any broker for such services.