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3x + 0,5y + 0,5z = 61.000
x + 2y + 2z = 79.000
x = 15.000 => harga 1 kg jeruk
y = 20.000 => harga 1 kg mangga
z = 12.000 => harga 1 kg jambu
Harga 0,5 jeruk + 1,5 mangga + 1kg jambu:
0,5(15.000) + 1,5(20.000) + 12.000 = 7.500 + 30.000 + 12.000
= 49.500