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Jumlah karyawan administrasi = y maka
4 + y = x.............., (i)
31000x = 4(25000) + 35000y
31000x = 100000 + 35000y ....... (ii)
Substitusikan (i) ke (ii)
31000x = 100000 + 35000y
31000 (4 + y) = 100000 + 35000y
124000 + 31000y = 100000 + 35000y
124000-100000 = 35000y - 31000y
24000 = 4000y
y = 24000 / 4000 = 6
Jadi jumlah karyawan administrasi adalah 6 orang.
Jawab. C.