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3x + y = 47.500 x2
5x + 2y = 82.500
6x + 2y = 95.000 -
-x = - 12.500
x = 12.500
3(12.500) + y = 47.500
37.500 + y = 47.500
y = 10.000
4x + 3y = 4(12.500) + 3(10.000)
= 50.000 + 30.000
4x + 3y = 80.000
jadi harga yang harus dibayar ali adalah Rp 80.000