According to data from a web aggregator collected about two social media sites, one site for posting pictures of cats and another site for posting pictures of food acquired the same number of unique visitors in 2012. The site for posting pictures of cats took 59 months to acquire these visitors while the site for posting pictures of food took 28 months. The site for posting pictures of food had a rate of visitor growth of 440,000 more a month, on average, tha he site for posting pictures of cats. Find the average rate of growth of the site for posting pictures of cats. The average rate of growth is visitors per month.