Okay, so Ada has a mix of marketing and management skills, which are valuable. She has certifications in Advanced Access and Advanced Excel, which indicate a level of expertise. Marketing professionals with similar experience and skills in the US can charge between $100-$200 per hour, depending on the industry and location. Since Ada is in Cambridge, MA, a hub for tech and marketing, her rate might be on the higher side of that range. Considering her certifications and skills, I'd estimate her hourly rate to be around $125, which is slightly above the average but still reasonable for her experience and location.