Lawyer was a solo practitioner. Lawyer used the same standard form engagement agreement with all of Lawyer's clients. That agreement provided that clients would be responsible for all reasonable and necessary out-of-pocket expenses that Lawyer incurred on behalf of clients. Lawyer employed Office Manager to handle the administrative operations of Lawyer's law office. To increase the profitability of the practice, Office Manager "marked up" by 10% the actual costs of expenses incurred on behalf of clients and billed the clients for the larger amount without revealing the "mark up." Lawyer had provided no training to Office Manager regarding Lawyer's professional responsibilities. Lawyer did not know that Office Manager "marked up" expenses until clients had been billed for inflated expenses for years. When Lawyer found out, Lawyer immediately fired Office Manager and stopped the practice of "marking up" expenses. Did Lawyer violate the Model Rules of Professional Conduct