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karyawan wanita=y
maka
640000x+580000y/x+y=600000
640000x+580000y=600000x+600000y
40000x=20000y
x:y=1:2=perbandingan jumlah karyawan pria dan wanita
Wanita = 600-580 = 20
Dibalik jadinya : P:W = 20:40 = 1:2/e