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20 000 - 600 = 19 400 + 400 = 19 800
Wu = 400 : 20 000 * 1000 = 20‰
Wz = Z : L * 1000
Wz = 600 : 20 000 * 1000 = 30‰
Wpn = Wu - Wz
Wpn = 20 - 30 = - 10‰
Liczba ludności w tym mieście pod koniec roku --> 20 000 - 600 = 19 400 + 400 = 19 800.