I have a very bulky file about 1M lines like this:

```
4001    168991  11191   74554   60123   37667   125750  28474
8   145 25  101 83  51  124 43
2985    136287  4424    62832   50788   26847   89132   19184
3   129 14  101 88  61  83  32 1    14      10  12  7   13  4
6136    158525  14054   100072  134506  78254   146543  41638
1   40  4   14  19  10  35  4 
2981    112734  7708    54280   50701   33795   75774   19046
7762    339477  26805   148550  155464  119060  254938  59592
1   22  2   12  10  6   17  2 
6   136 16  118 184 85  112 56 1    28  1   5   18  25  40  2
1   26  2   19  28  6   18  3 
4071    122584  14031   69911   75930   52394   89733   30088
1   9   1   3   4   3   11  2 14    314 32  206 253 105 284 66

```

I want to remove rows that have a value less than 100 in the second column. 

How to do this with sed?