If the number of views on the first day was 4000, the video's views on Youtube increased by 10*4000= 40000 after four days.
The total number of views of the video on Youtube after four days was 40000+4000 = <<40000+4000=44000>>44000
If 50000 more people viewed the video, the total number of views that the Youtube video had is 44000+50000 = 94000
#### 94000