Jawabanmu

2014-04-19T20:32:10+07:00
A x 9 / 100 x 10/ 12 = 2.580.000 - a
3a/40 = 2.580.000 - a
3a + 40 a = 40 x 2.580.000
43a = 40 x 2.580.000
a = 2.400.000 (tabungan awal)
semoga bermanfaat

2014-04-19T21:20:12+07:00
Tabungan mula mula chika adalah rp.2.400.000