In a week, each section collected 280/2 = <<280/2=140>>140 kilos of newspapers.
So, in three weeks, one section collected 140 x 3 = <<140*3=420>>420 kilos.
So, the four sections collected a total of 420 x 4 = <<420*4=1680>>1680 kilos.
Hence, their target is to collect 1680 + 320 = <<1680+320=2000>>2000 kilos of the newspaper.
#### 2000