Jawabanmu

2014-06-10T23:31:04+07:00
B + M = W X P X M + M
6.240.000 = 8/12 x 6/100 x M + M
6.240.000 = 2/3 x 6/100 x M + M
6.240.000 = 4/100 M +M
M = 100/104 X 6.240.000
    =  6.000.000

Tabungan mula - mula = Rp 6.000.000 ,00 

semoga membantu ... :)