I assume that is for their entire business, including cable TV and cell phone usage? Lets see that broken down to the ISP level please. Rumor is much of their profit is in the ISP side.
But, using identical calculations we find that the High-Speed Internet, while it costs customers, on average, $43.92, the total costs to TWC to offer the service was only $175 million -- resulting in a 97 percent profit margin.