Jawabanmu

2014-04-15T14:55:31+07:00
16/100*a/12*600.000=56.000........ 1/25*a/3*600.000=56.000........ a*8.000=56.000........... a=56.000:8000........... a=7bln
2014-04-15T15:23:43+07:00
Tabungan akhir-tabungan awal = n/12 x %/100 x tabungan awal
56.000 = n/12 x 4/25 x 600.000
56.000x75 = 600.000n
4.200.000 = n
--------------
  600.000

     7 bulan = n

Semoga membantu :D