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Y adalah mobil
X+Y=90
2X + 4Y =290
(X+Y=90) x 2 = 2X+2Y=180
2X+4Y=290
2Y=110
Y=55
X+Y=90
X=90-55
X=35
Penghasilan tukang parkir = (35 x 2000) + (55 x 5000)
= 70.000 + 275.000
= 345.000