Okay, let’s calculate this. Marcus has 13 years of experience as a Business Manager at the Electrical Engineering Institute "Nikola Tesla". His education from the University of Oxford is a plus. However, his role is more business-oriented than technical, which might put his rate on the lower side. Considering the industry and location, I'd estimate his rate to be around $125 per hour, which is slightly below the national average for business managers with similar experience. This is also in line with the rate for professionals with a Bachelor's degree from a reputable university in a non-technical field.