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harga 8 kg beras putih = 39000-21000
= 18000
harga 1 kg beras putih = 18000 : 8
=2250
8a + 12b = 39000
b=1750
8a + 21000 = 39000
8a = 39000 - 21000
8a = 18000
a = 18000/8
a = 2250
jadi harga 1kg beras putih adalah Rp 2.250,00