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Uang dini : Rp. 120.000 x 3 = Rp. 360.000,-
Total : 120.000 + 360.000 = Rp. 420.000,-
jumlah uang/jumlah perbandingan = selisih uang/selisih perbandingan
x/4 = 120.000/2
2x = 120.000 kali 4
2x = 480.000
x = 480.000/2
=240.000