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uang dini = 3/(3-1) x Rp 120000 = Rp 180000
jadi jumlah uang wati dan dini adalah Rp 240000
Wati = W .... Dini = D
W : D = 1 : 3 = n : 3n
D- W = 120.000
3n-n = 120.000
2n = 120.000
n = 120.000/2 = 60.000
jumlah = n+3n = 4n= 4(60.000) = 240.000
atau
W= n = 60.000
D=3n= 180.000 +
240.000