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a = 300.000
b = 0,85
kesimbangan jika S = 0
-a + (1- b)y = S
- 300.000 + (1 - 0,85)y = 0
- 300.000 + 0,15 y = 0
0,15 y = 300.000
y = 300.000 : (0,15) = 2.000.000