How to charge for the maintenance of integrated wiring?

According to the project budget, the basic charge price within 2 million yuan is 90,000 yuan, and the adjustment coefficient of weak current project is 1.3, that is, the design fee of weak current project with 2 million yuan can be about 1 1.7 million yuan (5.85%). Accept the user's entrustment to provide inspection technical services, standard information consultation, standard novelty retrieval, standard information inquiry and confirmation, etc. For the security technology prevention project and the information network integrated wiring project, the charging unit shall follow the principles of openness, fairness, impartiality, honesty and credit, and the principle of voluntary compensation by the client, sign an entrustment agreement with the client, provide qualified services in strict accordance with the business rules, and charge service fees according to the prescribed standards. Security technology prevention project, information network integrated wiring project, standard information consultation and other related service fees. Should be managed according to the operating service fee, and use the unified invoice of the tax authorities.