counting

This problem is solved here: https://web2.0calc.com/questions/counting-problem_147

10 - 99 : 4
100 - 999 : 69
1000 - 9999 : 603
10000 - 99999 : 5817
100000 - 999999 : 60378
1000000 - 9999999 : 602133
10000000 - 99999999 : 5987904
100000000 - 999999999 : 59994303
1000000000 - 9999999999 : 600225342

It is the last sum that you want ==600,225,342