During the first 3 weeks the factory made 320 caps + 400 caps + 300 caps = <<320+400+300=1020>>1020 caps total.
The average for the first 3 weeks is 1020 caps / 3 weeks = <<1020/3=340>>340.
If the factor makes the average during the fourth week they will make 1020 caps + 340 = <<1020+340=1360>>1360 caps.
#### 1360