Jawabanmu

2014-04-02T19:53:00+07:00
S = -a + (1-b)Y
S = -60 + 0,3 . 300.000
S = - 60 + 90000
S = 89940

itu jawabanku semoga benar ya :)
2014-04-02T19:53:02+07:00