Okay, let’s tackle this. So Mark has skills in Microsoft Office, which is a basic set of applications. Customer service and teaching are also valuable skills. However, the rate is quite low due to the lack of specific industry experience or advanced skills. Typically, professionals with similar skills in the US might charge $25-$50 per hour for basic administrative tasks. Considering Mark’s education from Yale School of City Planning, he might be able to command a higher rate, but without more information, it's difficult to estimate. Let’s assume a conservative rate of $50 per hour.