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6 X 4 = 24 M
60.000 x 6 = 360.000
60.000 : 2 = 30.000
360 rb +30 rb = 390.000
25 m = x (di umpamakan menjadi koefisien x) ======> di kali silang dgn yg di atas
4x = 25 x 60.000
4x = 1.500.000
x = 1.500.000 / 4
x = Rp. 375.000