Where do you see that? On your link I see: Data Transfer OUT From Amazon EC2 To Internet First 10 TB / Month $0.09 per GB Next 40 TB / Month $0.085 per G

Where do you see that? On your link I see: Data Transfer OUT From Amazon EC2 To Internet First 10 TB / Month $0.09 per GB Next 40 TB / Month $0.085 per GB Next 100 TB / Month $0.07 per GB Greater than 150 TB / Month $0.05 per GB Which means if you transfer out 90 TB in one month, it's $0.09 * 10000 + $0.085 * 40000 + $0.07 * 40000 = $7100.