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jumlah sumbangan = 30% x X x 400.000 + 45% x X x 200.000+ 25% x X x 120.000
= 120.000 X + 90.000 X + 30.000 X = 240.000 X
yang menyumbang 400.000 = 120.000X/240,000X = 1/2 atau 50%