I only read it briefly so it might be a mistake but this is where I got it from.
Adding your instance and data transfer fees, your total monthly cost in this example is $24,926. By comparison, if Amazon GameLift didn’t offer autoscaling and on-demand instances but instead required you to pay for instances by the month, then your instance fees would have been $1,209 per day ($0.311 * 162 instances * 24 hours) or $36,270 over a 30-day month. Your total monthly cost including $6,776 in data transfer fees would have been $43,046. Amazon GameLift would have saved you $18,120 per month, a 42% reduction over servers that run continuously all month