bantu jawab yaa :) pake cara

besar bunga = nBulan . persen . awal
bunga = 9/12 . 12/100 . a
awal + bunga = 3815000
1awal + 9/100 .a = 3815000
100/100 .a + 9/100 .a = 3815000
109/100 /a = 3815000
100/109 .109/100 . a = 100/109 . 3815000
a = 3500000