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PN= 25/100 x a = 75 orang.
PN= 1/4 x a = 75
a= 75 x 4 = 300 orang.
Jadi, jumlah seluruh warga yg bekerja tsb adl 300 orang.
Ditanya : Pegawai Swasta?
= 25%+15%+40% – 100% = 20%
PS = 20/100 x 300 = 60 orang