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5A + 3B = 1.140.000
5 (2/3 .B) + 3B = 1.140.000
10/3.B + 3B = 1.140.000
19/3.B = 1.140.000
B = 1.140.000 x 3/19
B = 180.000
A = 2/3 .B
= 2/3 x 180.000
= 120.000
4A + 2B = 4 .120.000 + 2 . 180.000
= 480.000 + 360.000
= 840.000 ..... jawaban : C