To calculate the rate at which George's follower count has increased per day, we can divide the total increase in followers by the number of days. In this case, the total increase is 350 - 200 = 150 followers, and the time period is 7 days. So, the rate of increase per day would be 150 followers / 7 days = 21.43 followers per day (rounded to two decimal places). Therefore, George's follower count has been increasing at a rate of approximately 21.43 followers per day since he posted the video.
