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maka :
harga 1 kg jeruk = 18.000
harga salak = harga jeruk - 4000
= 18.000 - 4000
= Rp. 14.000
JIka 1 kg Jeruk = 18.000 maka
1 kg salak = (1/2(18.000 - 4000))
= 1/2 * 14.000
= 7.000