The median monthly rent for a one-bedroom apartment in Seattle is nearly $2,000, while the median rent for the same apartment type in Detroit is $780. So, Detroit is clearly the more affordable market, right? Wrong. A new study by Rent.com released Friday reveals that determining rent affordability is far more complicated than simply examining rental rates. The median annual income plays a large part in affordability, thus why Seattle, with it’s $2,000 per month median rent, is more affordable than the Motor City. In Detroit, the average worker earns about $22,000 post-tax, which means that housing costs account for a whopping 42 percent of their monthly expenses — 12 percent more than the affordability threshold of 30 percent. Meanwhile, in Seattle, the average worker has a net income of $63,600, which means housing costs account for 38 percent of monthly expenses. That’s still above the affordability threshold, but 4 percent more affordable than Detroit. “The same De...