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I was confused about the 520 at the start.
First question:
The average number of workers is (3200 + 2000)/2 = 2600
3200-2000 =1200 (workers lost)
1720-1200 = 520
or
3200 – 1720 = 1480
2000-1480 = 520
So the labour turnover is 520 / 2600 = 20%
I’m not explaining it well but I understand sorry!
