After half an hour, the number of balloons that had blown up is 1/5*200 = <<1/5*200=40>>40
The number of balloons that haven't blown up so far is 200-40 = <<200-40=160>>160
In the next hour, 2*40 = <<2*40=80>>80 balloons blow up.
The number of balloons that haven't blown up now is 160-80 = <<160-80=80>>80
#### 80