Okay, let’s tackle this. So Ruthy Marks is an interior designer with experience. The rate for interior designers can vary widely depending on location, experience, and industry demand. In Miami, Florida, interior designers can charge between $50-$150 per hour, with more experienced designers charging upwards of $100-$200 per hour. Considering Ruthy's experience and location, I'll estimate her rate to be around $75 per hour, which is on the lower end of the scale but still reflects her skills and expertise.